[vijos1514]天才的记忆

Posted 2020-09-23

ST表模板题目

#include <cstdio>
#include <cmath>
#include <algorithm>
using namespace std;
int n,m,Maxsum[200005][20];
int main(){
    scanf("%d",&n);
    for(int i=1;i<=n;i++){
        scanf("%d",&Maxsum[i][0]);
    }
    int fuck = log(n) / log(2);
    for(int j=1;j<=fuck;j++)
        for(int i=1;i<=n;i++)
            if(i+(1<<j)-1 <= n){
                Maxsum[i][j] = max(Maxsum[i][j-1],Maxsum[i+(1<<(j-1))][j-1]);
            }
    scanf("%d",&m);
    while(m--){
        int x,y;
        scanf("%d%d",&x,&y);
        fuck = log(y-x+1) / log(2);
        printf("%d\n",max(Maxsum[x][fuck],Maxsum[y-(1<<fuck)+1][fuck]));
    }
    return 0;
}