#include<stdio.h> int main(){     int n,m=0,sign=1;     double sum=0;     scanf("%d",&n);     for(int i=1;i<=2*n-1;i+=2){         m=m+sign*i;         sign*=-1;         sum=sum+1.0/m;     }     printf("%.3lf",sum); }

#include<stdio.h> int main(){     int n;     double sum = 0;     scanf("%d",&n);     for(int i = 1;i<=n;i++){         sum = sum+1.0/i;     }     printf("%.6lf",sum); }

#include<stdio.h> int main(){     int y,k,n,f=1;     scanf("%d%d%d",&y,&k,&n);     for(int i=0;i*k<=n;i++){         if(i*k>=y){             f=0;             printf("%d ",i*k-y);         }     }     if(f){         printf("-1");     } }

#include<stdio.h> int main(){     int n,a,b,position;     scanf("%d%d%d",&n,&a,&b);     if((a+b)>=n){         position=n-a;     }     else{         position=b+1;     }     printf("%d",position); }

#include<stdio.h> #include<math.h> int main(){     int a,b,M,c,d;     scanf("%d%d%d",&a,&b,&M);     if(a!=0){         a=abs(a);     }     if(b!=0){         b=abs(b);     }     if((M-a-b)%2==0&&M>=(a+b)){         printf("Yes");     }     else{   ...

#include<stdio.h> int main(){     int n,k,min,max;     scanf("%d%d",&n,&k);     if(k==0||k==n){         min=0;         max=0;     }     else{         min=1;         if(2*k<n){             max=2*k;         }         else{             max=n-k;         }     }     printf(&quo...

#include<stdio.h> int main(){     int n,m,a;     int width,longwise;     scanf("%d%d%d",&n,&m,&a);     width=n/a;     longwise=m/a;     if(n%a!=0){         width++;     }     if(m%a!=0){         longwise++;     }     printf("%d",width*longwise); }

#include<stdio.h> int main(){     int n,m;     scanf("%d%d",&n,&m);     int a[n][m];     for(int i=0;i<n;i++){         for(int j=0;j<m;j++){             scanf("%1d",&a[i][j]);         }     }     int win,team[n],sum=0;     for(int j=0;j<m;j++){         ...

include<stdio.h> int main(){int n,m;scanf("%d%d",&n,&m);char ch[n][m];getchar();for(int i=0;i<n;i++){for(int j=0;j<m;j++){scanf("%c",&ch[i][j]);}getchar();}int sum=0;for(int i=0;i<n-1;i++){for(int j=0;j<m-1;j++){if(ch[i][j]!='f'&&ch[i][j+1]!=...

#include<stdio.h> int main() {int n,m;  int i,j,sum; scanf("%d%d",&n,&m); char str[n][m]; getchar(); for(i=0;i<n;i++) {for(j=0;j<m;j++) {scanf("%c",&str[i][j]);} getchar();} for(i=0;i<n;i++) {for(j=0;j<m;j++) {if(str[i][j]=='?')    //如果当前元素为非雷区，遍历四周元...

include<stdio.h> int main(){int n;scanf("%d",&n);int a[n][n],i,j,count=1;for(i=0;i<n;i++){if(i%2==0){for(j=0;j<=i;j++){a[i-j][j]=count;//(i-j)+j=i=层数;count++;}}else{for(j=0;j<=i;j++){a[j][i-j]=count;count++;}}}for(int i=n;i<2*n-1;i++){if(i%2==0){for(j=n-1;j>=i-(n-1...

include<stdio.h> int main(){int n,m;scanf("%d",&n);int a[n][n];int p=0,q=n-1,count=1;while(count<=n*n){for(int i=p;i<=q;i++){a[p][i]=count;count++;}for(int i=p+1;i<=q;i++){a[i][q]=count;count++;}for(int i=q-1;i>=p;i--){a[q][i]=count;count++;}for(int i=q-1;i>=p+1;i-...

include<stdio.h> int main(){int n,a[20],b[20]={0},m=-1,pos;scanf("%d",&n);for(int i=0;i<n;i++){scanf("%d",&a[i]);}for(int i=0;i<n;i++){for(int j=0;j<n;j++){if(a[j]==a[i]){b[i]++;}}}for(int i=0;i<n;i++){if(b[i]>m){m=b[i];pos=i;}}printf("%d",a...

include<stdio.h> int main(){int n;while(scanf("%d",&n)!=EOF){int a[n];for(int i=0;i<n;i++){scanf("%d",&a[i]);}int m;scanf("%d",&m);for(int j=0;j<n;j++){if(a[j]==m){for(int k=j;k<n;k++){a[k]=a[k+1];}--n;break;}}for(int z=0;z<n;z++){printf(&q...