2021牛客暑期多校训练营2补题记录

Arithmetic Progression

#include <bits/stdc++.h>
#define dbg(a...) fprintf(stderr, a)
template <class T, class U>
inline bool smin(T &x, const U &y) {
  return y < x ? x = y, 1 : 0;
}
template <class T, class U>
inline bool smax(T &x, const U &y) {
  return x < y ? x = y, 1 : 0;
}
using LL = long long;
using PII = std::pair<int, int>;
constexpr int N(1e5 + 5);
int n, a[N];
#define ls o << 1
#define rs o << 1 | 1
LL min[N << 2], tag[N << 2];
int cnt[N << 2], gcd[N << 2];
void pushup(int o) {
    min[o]=std::min(min[o*2],min[o*2+1]);
    cnt[o]=0;
    if(min[o]==min[o*2]){
        cnt[o]+=cnt[o*2];
    }
    if(min[o]==min[o*2+1]){
        cnt[o]+=cnt[o*2+1];
    }
    min[o] += tag[o];
    if(gcd[o*2]==gcd[o*2+1]){
        gcd[o]=gcd[o*2];
    }else{
        gcd[o]=-1;
    }
}
void add(int o, int l, int r, int x, int y, int z) {
  if (x <= l && r <= y) {
    min[o] += z;
    tag[o] += z;
    return;
  }
  int m = l + r >> 1;
  if (x <= m) add(ls, l, m, x, y, z);
  if (y > m) add(rs, m + 1, r, x, y, z);
  pushup(o);
}
int ask(int o, int l, int r, int x, int y, int z) {
  if (y < l || r < x) return 0;
  if (x <= l && r <= y) return min[o] + z == 0 ? cnt[o] : 0;
  int m = l + r >> 1;
  z += tag[o];
  return ask(ls, l, m, x, y, z) + ask(rs, m + 1, r, x, y, z);
}
int s1[N], s2[N], t1, t2; // min, max
void update(int rt,int l,int r,int L,int R,int z){
    if(gcd[rt]>0&&z%gcd[rt]==0){
        min[rt]-=gcd[rt];
        tag[rt]-=gcd[rt];
        return;
    }
    int mid=(l+r)>>1;
    if(l==r){
        int t=gcd[rt];
        gcd[rt]=std::gcd(gcd[rt],z);
        min[rt]-=(gcd[rt]-t)*(R-l)+gcd[rt];
        cnt[rt]=1;
        return;
    }
    if(L<=mid)update(rt*2,l,mid,L,R,z);
    if(R>mid)update(rt*2+1,mid+1,r,L,R,z);
    pushup(rt);
}
int main(){
 std::ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
  int t;
  std::cin >> t;
  while (t--) {
    std::cin >> n;
    memset(min, 0, n + 1 << 5);
    memset(tag, 0, n + 1 << 5);
    memset(cnt, 0, n + 1 << 4);
    memset(gcd, 0, n + 1 << 4);
    for (int i = 1; i <= n; i++) {
      std::cin >> a[i];
    }
    LL ans = n;
    t1 = t2 = s1[1] = s2[1] = 1;
    for (int i = 2; i <= n; i++) {
      while (t1 && a[s1[t1]] > a[i]) {
        add(1, 1, n, s1[t1 - 1] + 1, s1[t1], a[s1[t1]]);
        t1--;
      }
      while (t2 && a[s2[t2]] < a[i]) {
        add(1, 1, n, s2[t2 - 1] + 1, s2[t2], -a[s2[t2]]);
        t2--;
      }
      add(1, 1, n, s1[t1] + 1, i, -a[i]);
      add(1, 1, n, s2[t2] + 1, i, a[i]);
      s1[++t1] = s2[++t2] = i;
      update(1, 1, n, 1, i - 1, a[i] - a[i - 1]);
      ans += ask(1, 1, n, 1, i - 1, 0);
    }
    std::cout << ans << "\n";
  }
  return 0;
}

Cannon

#include<bits/stdc++.h>
using namespace std;

#define dbg(x...) do { cout << #x << " -> "; err(x); } while (0)
void err () {   cout << endl;}
template <class T, class... Ts>
void err(const T& arg, const Ts&... args) { cout << arg << ' '; err(args...);}

#define ll long long
#define ull unsigned long long
#define LL __int128
#define inf 0x3f3f3f3f
#define INF 0x3f3f3f3f3f3f3f3f
#define pii pair<int, int>
#define PII pair<ll, ll>
#define fi first
#define se second
#define pb push_back
#define mp(a,b) make_pair(a,b)
#define IOS ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define PAUSE system("pause");
const double Pi = acos(-1.0);
const double eps = 1e-8;
const int maxn = 1e7 + 10;
const int maxm = 6e2 + 10;
const int mod = 1e9 + 9;
const int P = 131;
const int S = 5;

inline ll rd() {
    ll f = 0; ll x = 0; char ch = getchar();
    for (; !isdigit(ch); ch = getchar()) f |= (ch == '-');
    for (; isdigit(ch); ch = getchar()) x = (x << 1) + (x << 3) + ch - '0';
    if (f) x = -x;
    return x;
}
void out(ll a) {if(a<0)putchar('-'),a=-a;if(a>=10)out(a/10);putchar(a%10+'0');}
#define pt(x) out(x),puts("")
inline void swap(ll &a, ll &b){ll t = a; a = b; b = t;}
inline void swap(int &a, int &b){int t = a; a = b; b = t;}
inline ll min(ll a, ll b){return a < b ? a : b;}
inline ll max(ll a, ll b){return a > b ? a : b;}

int n, m, s[maxn], s1[maxn], s2[maxn];
int f1[maxn], f2[maxn], qpow2[maxn], inv[maxn];

ll qpow(ll n, ll k, ll mod) {
    ll ans = 1;
    while(k) {
        if(k & 1)
            ans = ans * n % mod;
        n = n * n % mod;
        k >>= 1;
    }
    return ans;
}

void init(){
    s[0] = 1;
    s[1] = 1;
    qpow2[0] = 1;
    qpow2[1] = 2;
    inv[0] = 1;
    inv[1] = 1;
    for(int i = 2; i <= maxn - 5; ++i) {
        inv[i] = (ll)(mod - mod / i) * inv[mod % i] % mod;
    }  
    for(ll i = 2; i <= maxn - 5; i++){
        s[i] = (ll)s[i - 1] * i % mod;
        qpow2[i] = (ll)qpow2[i - 1] * 2ll % mod;
        inv[i] = (ll)inv[i - 1] * (ll)inv[i] % mod;
    }
}

ll c(ll n, ll m){
    if(n < m) return 0;
    return (ll)s[n] * (ll)inv[m] % mod * (ll)inv[n - m] % mod;
}

void solve(){
    n = rd(), m = rd();
    n -= 2, m -= 2;
    s1[n + m] = 1;
    for(int i = n + m; i >= 1; i--) {
        s1[i - 1] = ((2ll * s1[i] % mod - 1ll * c(n + m - i, n) % mod + mod)) % mod;
    }
    s2[n - 1] = 1;
    for(int i = n - 1; i >= 1; i--) {
    //    s2[i - 1] = ((s2[i] % mod + 1ll * c(n + m - i, n - i) % mod + mod)) % mod;

        s2[i - 1] = ((2ll * s2[i ] % mod + 1ll * c(n + m - i, n - i) % mod + mod)) % mod;
    }
    //cout<<"DD"<<s2[m+n]<<endl;
    for(int i = n + m; i >= 0; i--) {
        s1[i] = (s1[i] - s2[i] + mod) % mod;
    }
    ll ans1 = 0, ans2 = 0;
    for(int i = 0; i <= n + m; i++) {
        f1[i] = (ll)qpow2[i] * s[n + m] % mod * inv[n + m - i] % mod;
        f2[i] = (ll)qpow2[i] * s[n] % mod * s[m] % mod * inv[n + m - i] % mod * s1[i] % mod;
    }
    for(int i = 0; i <= n + m; i++) {
        ans1 ^= f1[i];
        ans2 ^= f2[i];
    }
    printf("%lld %lld\n", ans1, ans2);
}

int main() {
    int t = 1;
    init();
    while(t--)
        solve();
    return 0;
}

Draw Grids

#include<iostream>

using namespace std;

int n,m;

int main(){
    cin>>n>>m;
    int ans=(n-1)*m+(m-1);
    if(ans&1)    puts("YES");
    else    puts("NO");
}

Er Ba Game

#include<bits/stdc++.h>
using namespace std;
#define int long long
const int N =1e5+10,M =2*N;
int a[2020][2020];
int ver[M], edge[M],nxt[M], head[N], tot,val[N];
int root,n;
void add(int x, int y) {
    ver[++tot]=y, nxt[tot]=head[x], head[x]=tot;
}
set<int>s;
void dfs(int x,int fa){
    cout<<x<<" "<<fa<<endl;
    s.insert(val[x]);
    a[root][x]=s.size();
    for(int i=head[x];i;i=nxt[i]){
        int y=ver[i];
        if(y==fa)continue;
        s.insert(val[y]);
        dfs(y,x);
        s.erase(s.find(val[y]));
    }
}
signed main() {
//    freopen("1009.in","r",stdin);
    int T;
    cin>>T;
    while(T--){
        tot=0;
         int n;scanf("%d",&n);
        for(int i=1;i<=n;i++)head[i]=0;
        for(int i=2;i<=n;i++){
             int y;scanf("%d",&y);
             add(i,y);add(y,i);
        } 
        for(int i=1;i<=n;i++)scanf("%d",&val[i]);
        for(root=1;root<=n;root++){
            dfs(root,0);
        }

        for(int i=1;i<=n;i++){
            for(int j=1;j<=n;j++){
                printf("%d ",a[i][j]);
            }
            cout<<endl;
        }
    }
    return 0;
}

Gas Station

#include <iostream>
#include <cstring>
#include <algorithm>
#include <vector>
#define int long long
using namespace std;

const int N = 100010, M = N * 2;

int n, m;
int h[N], e[M], w[M], ne[M], a[N],idx;
bool st[N];
int in[N],id[N],out[N];
struct node{
    int d,p,id;
};
vector<node>ans[N];

int Res[N];

int cnt;
int sum[N],up[N],dn[N];
int p[N];

int c[N];

void add(int p, int x) {
  for (; p <= cnt; p += p & -p) c[p] += x;
}
int ask(int p) {
  int r = 0;
  for (; p; p -= p & -p) r += c[p];
  return r;
}

void pre(int x,int fa){
    if(st[x])return;
    in[x]=++cnt;
    id[cnt]=x;
    for(int i=h[x];~i;i=ne[i]){
        int y=e[i];
        if(y==fa)continue;
        pre(y,x);
    }
    out[x]=cnt;
}
void get_dist(int u,int fa){
    if(st[u])return;
    for(int i=h[u];~i;i=ne[i]){
        int y=e[i];
        if(y == fa)continue;
        sum[y]=sum[u]+a[y]-w[i];
        up[y]=max((long long)0,up[u]+w[i]-a[y]);
        dn[y]=max(dn[u],w[i]-sum[u]);
        get_dist(y,u);
    }
}
void add(int a, int b, int c)
{
    e[idx] = b, w[idx] = c, ne[idx] = h[a], h[a] = idx ++ ;
}
int get_wc(int u, int fa, int tot, int& wc)  // 求重心
{
    if (st[u]) return 0;
    int sum = 1, ms = 0;
    for (int i = h[u]; ~i; i = ne[i])
    {
        int j = e[i];
        if (j == fa) continue;
        int t = get_wc(j, u, tot, wc);
        ms = max(ms, t);
        sum += t;
    }
    ms = max(ms, tot - sum);
    if (ms <= tot / 2) wc = u;
    return sum;
}
int get_size(int u,int fa){
    if(st[u])return 0;
    int res=1;
    for(int i=h[u];~i;i=ne[i]){
        if(e[i]!=fa){
            res+=get_size(e[i],u);
        }
    }
    return res;
}
struct Qry {
  long long d;
  int l, r, p, id;
  bool operator<(const Qry &rhs) const {
    return d < rhs.d;
  }
} s[N];
int tot;
void calc(int u){
//    cout<<u<<endl;
    if(st[u])return;
    int res=0;
    get_wc(u,-1,get_size(u,-1),u);

    cnt=tot=0;
    up[u] = dn[u] = 0;
    sum[u] = a[u];

    pre(u,0);
    get_dist(u,-1);

    st[u]=true;

    for (auto [d, p, id] : ans[u]) {
        if (p == u) continue;
        int l = 0, r = 0;
        if (in[p]) l = in[p], r = out[p];
        s[++tot] = {d, l, r, 0, id};
    }

    for(int i=h[u];~i;i=ne[i]){
        int y=e[i];
        if(st[y])continue;
        for (int i = in[y]; i <= out[y]; i++) {
        int x = id[i];
        for (auto [d, p, id] : ans[x]) {
            if (d < up[x] || in[p] <= in[x] && out[x] <= out[p]) continue;

            int l = 0, r = 0;
            if(in[p] && !(in[y] <= in[p] && out[p] <= out[y])) l = in[p], r = out[p];
                s[++tot] = {d + sum[x] - a[u], l, r, y, id};
            }
        }
    }
      std::sort(s + 1, s + 1 + tot);
  for (int i = 1; i <= cnt; i++) p[i] = id[i];
  std::sort(p + 1, p + 1 + cnt, [&](int i, int j) {
    return dn[i] < dn[j];
  });
  for (int i = 1; i <= cnt; i++) c[i] = 0;
  for (int i = 1, j = 1; i <= tot; i++) {
    for (; j <= cnt && dn[p[j]] <= s[i].d; j++) {
      add(in[p[j]], 1);
    }
    Res[s[i].id] += j - 1;
    if (s[i].l) Res[s[i].id] -= ask(s[i].r) - ask(s[i].l - 1);
    if (s[i].p) Res[s[i].id] -= ask(out[s[i].p]) - ask(in[s[i].p] - 1);
    // std::cerr << "!! " << ans[s[i].id] << "\n";
  }
  for (int i = 1; i <= cnt; i++) {
    in[id[i]] = out[id[i]] = 0;
  }


    for(int i=h[u];~i;i=ne[i])calc(e[i]);
}
signed main(){
        scanf("%lld%lld",&n,&m);
        memset(h,-1,sizeof h);
        idx=0;
        for(int i=0;i<n-1;i++){
            int a,b,c;
            scanf("%lld%lld%lld",&a,&b,&c);
            add(a,b,c),add(b,a,c);
        }
        for(int i=1;i<=n;i++){
            scanf("%lld",&a[i]);
        }
        for(int i=1;i<=m;i++){
            int x,d,p;
            scanf("%lld%lld%lld",&x,&d,&p);
            ans[x].push_back((node){d,p,i});
        }
        calc(1);
        for(int i=1;i<=m;i++){
            printf("%lld\n",Res[i]);
        }
        return 0;
}

Girlfriend

#include<bits/stdc++.h>
using namespace std;
const double pi = acos(-1);
struct node{
    double x,y,z;
}a,b,c,d;
struct circle{
    double r;
    double x,y,z;
}Cir;
void deal(node a,node b,double k){
    double tmp=k*k-1;
    double tmpx=a.x-k*k*b.x;
    double tmpy=a.y-k*k*b.y;
    double tmpz=a.z-k*k*b.z;
    double tmp2=k*k*(b.x*b.x+b.y*b.y+b.z*b.z)-(a.x*a.x+a.y*a.y+a.z*a.z);
    tmpx/=tmp,tmp2/=tmp;tmpy/=tmp,tmpz/=tmp;
    Cir.x=-tmpx;
    Cir.y=-tmpy;
    Cir.z=-tmpz;
    tmp2=Cir.x*Cir.x+Cir.y*Cir.y+Cir.z*Cir.z-tmp2;
    Cir.r=sqrt(tmp2);
}
double dis(circle c1,circle c2){
    return sqrt((c1.x-c2.x)*(c1.x-c2.x)+(c1.y-c2.y)*(c1.y-c2.y)+(c1.z-c2.z)*(c1.z-c2.z));
}
int main(){
    //freopen("data.in","r",stdin);
    int t;
    scanf("%d",&t);
    while(t--){
        scanf("%lf%lf%lf",&a.x,&a.y,&a.z);
        scanf("%lf%lf%lf",&b.x,&b.y,&b.z);
        scanf("%lf%lf%lf",&c.x,&c.y,&c.z);
        scanf("%lf%lf%lf",&d.x,&d.y,&d.z);
        double k1,k2;
        scanf("%lf%lf",&k1,&k2);
        deal(a,b,k1);
        circle c1=Cir;
        deal(c,d,k2);
        circle c2=Cir;
        double dd=dis(c1,c2);
        double ans=0;
        if(dd>=c1.r+c2.r){
            ans=0;
        }else if(dd+c1.r<=c2.r){
            ans=(4.0/3.0)*pi*c1.r*c1.r*c1.r;
        }else if(dd+c2.r<=c1.r){
            ans=(4.0/3.0)*pi*c2.r*c2.r*c2.r;
        }else{
            double cal=(c1.r*c1.r+dd*dd-c2.r*c2.r)/(2.0*c1.r*dd);
            double h=c1.r*(1.0-cal);
            ans+=pi*h*h*(c1.r-h/3.0);
            cal=(c2.r*c2.r+dd*dd-c1.r*c1.r)/(2.0*c2.r*dd);
            h=c2.r*(1.0-cal);
            ans+=pi*h*h*(c2.r-h/3.0);
        }
        printf("%.6lf\n",ans);
    }
    return 0;
}

League of Legends

#include <bits/stdc++.h>
using namespace std;
const int N=5005;
typedef long long ll;
ll f[N][N];
struct Seg{
    int l,r;
}p[N],s[N];

int ida,idb;
int big[N];
bool isbig[N];
bool cmp(int A,int B)
{
    return A>B;
}

bool cnp(Seg A,Seg B)
{
    return A.l<B.l;
}

int main()
{
    int n,k;
    scanf("%d%d",&n,&k);
    for(int i=1;i<=n;i++)
        scanf("%d%d",&p[i].l,&p[i].r);
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=n;j++)
        {
            if(i==j||isbig[j])    continue;
            if(p[i].l<=p[j].l&&p[j].r<=p[i].r)
            {
                isbig[i]=true;
                break;
            }
        }
    }
    for(int i=1;i<=n;i++)
    {
        if(isbig[i])    big[++idb]=p[i].r-p[i].l;
        else            s[++ida]=p[i];
    }
    sort(s+1,s+1+ida,cnp);
    sort(big+1,big+1+idb,cmp);
    memset(f,-0x3f,sizeof f);
    f[0][0]=0;
    for(int i=1;i<=k;i++)
    {
        deque<int>q;q.push_back(0);
        for(int j=1;j<=ida;j++)
        {
            while(q.size()&&s[q.back()+1].r<=s[j].l)   q.pop_back();
            if(q.size())    f[i][j]=f[i-1][q.back()]+s[q.back()+1].r-s[j].l;
            while(q.size()&&f[i-1][j]+s[j+1].r>=f[i-1][q.front()]+s[q.front()+1].r) q.pop_front();
            q.push_front(j);
        }
    }
    ll ans=0,res=0;
    for(int i=0;i<=min(k-1,idb);i++)
    {
        res+=big[i];
        if(f[k-i][ida]>=0)  ans=max(ans,f[k-i][ida]+res);
    }
    printf("%lld\n",ans);
    return 0;
}

Penguins

#include<bits/stdc++.h>
#define ll long long
const double pi = acos(-1);
using namespace std;
char mpl[25][25],mpr[25][25];
char as[25][25][25][25];//存L,R,U,D
int vis[25][25][25][25];//存步数
int dirl[4][2] = {1,0,0,-1,0,1,-1,0};
int dirr[4][2] = {1,0,0,1,0,-1,-1,0};
char tag[] = "DLRU";
pair<pair<int,int>,pair<int,int> > lst[25][25][25][25];
void check1(int&x1,int&y1,int k){
    int u=x1+dirl[k][0];
    int v=y1+dirl[k][1];
    if(u<1||u>20||v<1||v>20||mpl[u][v]=='#'){
        u=x1;
        v=y1;
    }
    x1=u;
    y1=v;
}
void check2(int&x2,int&y2,int k){
    int u=x2+dirr[k][0];
    int v=y2+dirr[k][1];
    if(u<1||u>20||v<1||v>20||mpr[u][v]=='#'){
        u=x2;
        v=y2;
    }
    x2=u;
    y2=v;
}
void bfs(){
    queue<pair< pair<int,int>,pair<int,int> > >q;
    q.push({{20,20},{20,1}});
    as[20][20][20][1]='0';
    memset(vis,-1,sizeof(vis));
    vis[20][20][20][1]=0;
    while(q.size()){
        int x1=q.front().first.first,y1=q.front().first.second;
        int x2=q.front().second.first,y2=q.front().second.second;
        q.pop();
        for(int i=0;i<4;i++){
            int x3=x1,y3=y1,x4=x2,y4=y2;
            check1(x3,y3,i);
            check2(x4,y4,i);
            if(vis[x3][y3][x4][y4]!=-1)continue;
            vis[x3][y3][x4][y4]=vis[x1][y1][x2][y2]+1;
            as[x3][y3][x4][y4]=tag[i];
            lst[x3][y3][x4][y4]={{x1,y1},{x2,y2}};
            q.push({{x3,y3},{x4,y4}});
            if(x3== 1 && y3 == 20 && x4 == 1 && y4 == 1) {return;}
        }
    }
}
vector<char> ans;
int main(){
    for(int i=1;i<=20;i++){
        cin>>mpl[i]+1;
        cin>>mpr[i]+1;
    }
    bfs();
    int xa=1,ya=20,xb=1,yb=1;
    printf("%d\n",vis[xa][ya][xb][yb]);
    while(1){
        ans.push_back(as[xa][ya][xb][yb]);
        mpl[xa][ya]='A';
        mpr[xb][yb]='A';
        int u=lst[xa][ya][xb][yb].first.first,v=lst[xa][ya][xb][yb].first.second,w=lst[xa][ya][xb][yb].second.first,p=lst[xa][ya][xb][yb].second.second;
        xa=u;ya=v;xb=w,yb=p;
        if(vis[xa][ya][xb][yb]==0){
            mpl[xa][ya]='A';
            mpr[xb][yb]='A';
            break;
        }
    }
    reverse(ans.begin(),ans.end());
    for(int i=0;i<ans.size();i++){
        printf("%c",ans[i]);
    }
    cout<<endl;
    for(int i=1;i<=20;i++){
        printf("%s %s\n",mpl[i]+1,mpr[i]+1);
    }
    return 0;
}

Product of GCDs

#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef pair <int,int> Pii;
#define reg register
#define mp make_pair
#define pb push_back
#define Mod1(x) ((x>=Phi)&&(x-=Phi))
#define Mod2(x) ((x<0)&&(x+=Phi))
#define rep(i,a,b) for(int i=a,i##end=b;i<=i##end;++i)
#define drep(i,a,b) for(int i=a,i##end=b;i>=i##end;--i)
template <class T> inline void cmin(T &a,T b){ ((a>b)&&(a=b)); }
template <class T> inline void cmax(T &a,T b){ ((a<b)&&(a=b)); }


const int N=8e4+10,M=1e7+30;

int n,m;
ll P,Phi;
int notpri[M+1],pri[M/5],pc;
ll A[N],C[N][32];

ll Calc(ll n){
    ll p=n;
    for(int i=1;1ll*pri[i]*pri[i]<=n;++i) if(n%pri[i]==0) {
        p=p/pri[i]*(pri[i]-1);
        while(n%pri[i]==0) n/=pri[i];
    }
    if(n>1) p=p/n*(n-1);
    return p;
}
void init(){
       rep(i,2,M) {
        if(!notpri[i]) pri[++pc]=i;
        for(int j=1;j<=pc && 1ll*i*pri[j]<=M;++j) {
            notpri[i*pri[j]]=1;
            if(i%pri[j]==0) break;
        }
    }
}

ll Mul(ll x,ll y){
    return (__int128)x*y%P;
}
ll qpow(ll x,ll k) {
    ll res=1;
    for(;k;k>>=1,x=Mul(x,x)) if(k&1) res=Mul(res,x);
    return res;
}
int main(){
       rep(i,2,M) {
        if(!notpri[i]) pri[++pc]=i;
        for(int j=1;j<=pc && 1ll*i*pri[j]<=M;++j) {
            notpri[i*pri[j]]=1;
            if(i%pri[j]==0) break;
        }
    }
    int t;
    cin>>t;
    while(t--){
        scanf("%d%d%lld",&n,&m,&P);
        Phi=Calc(P);
        for(int i=0;i<N;i++)A[i]=0;
        for(int i=1;i<=n;i++){
            int x;scanf("%d",&x);A[x]++;
        }
        rep(i,0,n) rep(j,*C[i]=1,min(i,m)) C[i][j]=C[i-1][j]+C[i-1][j-1],Mod1(C[i][j]);
        long long ans=1;
        for(int i=2;i<N;i++){
            long long res=0;
            if(notpri[i])continue;
            for(int x=i;x<N;x*=i){
                int c=0;
                for(int j=x;j<N;j+=x){
                    c+=A[j];
                }
                if(c<m)break;
                res=(res+C[c][m])%Phi;
            }
            if(res)ans=Mul(ans,qpow(i,res));
        }
        printf("%lld\n",ans);
    }
    return 0;
}

WeChat Walk

#include<iostream>
#include<cmath>
#include<vector>
using namespace std;
const int N=200010,M=10010;
typedef pair<int,int> PII;
int n,m,q,B;
int a[N],res[N];
vector<int> g[N],big[N];
vector<PII> e[M];
int main(){
    int n,m,q;
    cin>>n>>m>>q;
    B=sqrt(m);
    for(int i=1;i<=m;i++){
        int x,y;
        scanf("%d%d",&x,&y);
        g[x].push_back(y);
        g[y].push_back(x);
    }
    for(int i=1;i<=n;i++){
        if(g[i].size()>B){
            for(int j=0;j<g[i].size();j++){
                big[g[i][j]].push_back(i);
            }
        }
    }
    for(int i=1;i<=q;i++){
        int u,w;
        scanf("%d%d",&u,&w);
        e[a[u]+=w].push_back({u,i});
    }
   vector<int> f(n+1,q),las(n+1,q),mn(n+1,q);
    for(int i=1e4;i>=1;i--){
        for(auto [u,t]: e[i]){
            for(auto v : big[u]){
                mn[v]=min(mn[v],t);
            }
            las[u]=f[u];f[u]=t;
        }
        for(auto [u,t]: e[i]){
            if(g[u].size()<=B){
                int r=las[u];
                for(auto v :g[u]){
                    r=min(r,f[v]);
                }
                res[u]+=max(0,r-t);
            }else{
                res[u]+=max(0,min(mn[u],las[u])-t);
            }
        }
    }
    for(int i=1;i<=n;i++)cout<<res[i]<<endl;
    return 0;
}
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