cin cout都不要了
cin换快读 cout换printf
然后把你的
```ios::sync_with_stdio```
删掉试试？
by 233小问号 @ 2021-07-21 16:38:04
@[233小问号](/user/332486) 根据某大佬的测试，cin优化后比scanf快？
by wbs200 @ 2021-07-21 16:39:10
感觉可能是您快读写挂了
```cpp
#include<bits/stdc++.h>
using namespace std;
const int N=1e5+5;
int dp[N][30],b[N];
int gi() {
int x = 0, f = 1; char c = getchar();
while (c < '0' || c > '9') { if (c == '-') f = 0; c = getchar(); }
while (c >= '0' && c <= '9') x = (x << 3) + (x << 1) + c - 48, c = getchar();
return f ? x : -x;
}
int main(){
int n = gi(), m = gi();
for(int i=1;i<=n;i++){
dp[i][0] = gi();
b[i]=log2(i);
}
for(int j=1;(1<<j)<=n;j++){
for(int i=1;i+(1<<j)-1<=n;i++){
dp[i][j]=max(dp[i][j-1],dp[i+(1<<(j-1))][j-1]);
//cout<<dp[i][j]<<" ";
}
}
while(m--){
int l = gi(), r = gi();
int j=b[r-l+1];
printf("%d\n", max(dp[l][j],dp[r-(1<<j)+1][j]));
}
return 0;
}
```
by chenyilei @ 2021-07-21 16:39:18