1 课堂笔记 

 

  

 2 代码

3.代码解析 

 

#include<iostream>
using namespace std;
const int maxn=1010;
int a[maxn][maxn],s[maxn][maxn];
int n,m,q,x1,y1,x2,y2;int main(){scanf("%d%d%d",&n,&m,&q);//为数组赋值for(int i=1;i<=n;i++){for(int j=1;j<=m;j++){scanf("%d",&a[i][j]);}}//为前缀和赋值for(int i=1;i<=n;i++){for(int j=1;j<=m;j++){s[i][j] = s[i][j-1] + s[i-1][j] - s[i-1][j-1] +a[i][j];}}//输出结果while(q--){scanf("%d%d%d%d",&x1,&y1,&x2,&y2);printf("%d\n",s[x2][y2]-s[x2][y1-1]-s[x1-1][y2]+s[x1-1][y1-1]);}
}