美团9.13技术类编程题
五道题分别过了 91%, 100%, 45%, 55%, 100%
第一道, 二分，不知道漏了啥case，过了91%
public static void pro1(){
Scanner in = new Scanner(System.in);
int n = in.nextInt(), m = in.nextInt();
int[][] arr = new int[n][m];
for(int i = 0; i < n; i++){
for(int j = 0; j < m; j++){
arr[i][j] = in.nextInt();
}
}
if(n % 2 == 1){
printArr(arr, n, m);
return;
}
int row = n / 2;
while(true){
for(int i = 0; i < row; i++){
for(int j = 0; j < m; j++) {
if(arr[i][j] != arr[row + i][j]){
printArr(arr, row, m);
return;
}
}
}
row = row / 2;
}
}
private static void printArr(int[][] arr, int row, int m){
for(int p = 0; p < row; p++){
for(int q = 0; q < m; q++){
if(q == m - 1)
System.out.println(arr[p][q]);
else
System.out.print(arr[p][q] + " ");
}
}
}
第二道，简单的滑动窗口，AC
public static void prob2(){
Scanner in = new Scanner(System.in);
int n = in.nextInt(), m = in.nextInt(), k = in.nextInt();
int[] arr = new int[n];
for(int i = 0; i < n; i++){
arr[i] = in.nextInt();
}
int left = 0, right = 0;
long total = 0;
while(right < n){
while(right < n && arr[right] >= k){
right++;
}
int len = right - left;
if(len - m + 1 > 0){
total += len - m + 1;
}
right++;
left = right;
}
System.out.println(total);
}
private static int MOD = 998244353;
private static long total = 0;
public static void prob3(String[] args){
Scanner in = new Scanner(System.in);
int n = in.nextInt(), k = in.nextInt(), d = in.nextInt();
recursiveSum(n, k, d, false);
System.out.println(total);
}
private static void recursiveSum(int sum, int k, int d, boolean ifDHasAppeared){
if( (sum == 0 && ifDHasAppeared) || (sum == d && !ifDHasAppeared)) {
total = (total + 1) % MOD;
} else {
for(int i = 1; i <= k; i++){
if(i <= sum) {
if(i >= d) {
recursiveSum(sum - i, k, d, true);
} else {
recursiveSum(sum - i, k, d, ifDHasAppeared);
}
} else {
break;
}
}
}
}
第四道，齿轮，感觉是道阅读理解题，但是我好像漏了一些case, 只过了55%
public static void prob4(){
int mod = 998244353;
Scanner in = new Scanner(System.in);
while(in.hasNext()){
int n = in.nextInt();
String s = in.next();
long total = 0;
for(int i = 0; i < n; i++){
char ch = s.charAt(i);
if(ch == 'Z') {
continue;
}
if(i == 0) {
if(s.charAt(i + 1) != 'A'){
total = (total + 1) % mod;
}
} else if(i == n - 1) {
if(s.charAt(i - 1) != 'A') {
total = (total + 1) % mod;
}
}else{
// 按第一个按钮
if(s.charAt(i - 1) != 'A'){
total = (total + 1) % mod;
}
// 按第二个按钮
if(s.charAt(i + 1) != 'A'){
total = (total + 1) % mod;
}
}
}
// 不按按钮
System.out.println((total + 1) % mod);
}
}
第五道，考java基础掌握能力，一道简单的排序题，AC
static class Event{
int id;
int priority;
int necessity;
public Event(int id, int pri, int nec){
this.id = id;
this.priority = pri;
this.necessity = nec;
}
}
public static void prob5() {
Scanner in = new Scanner(System.in);
int n = in.nextInt();
Event[] events = new Event[n];
for(int i = 0; i < n; i++) {
events[i] = new Event(i + 1, in.nextInt(), in.nextInt());
}
Arrays.sort(events, (a, b)-> {
if (b.necessity != a.necessity) {
return (b.necessity - a.necessity);
}else{
return (b.priority - a.priority);
}
});
for(int i = 0; i < n; i++){
if(i != n - 1)
System.out.print(events[i].id + " ");
else
System.out.println(events[i].id);
}
}
求大佬指点我没有AC的题
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