题解 | #【模板】二维前缀和#
【模板】二维前缀和
https://www.nowcoder.com/practice/99eb8040d116414ea3296467ce81cbbc
#include <iostream>
#include<vector>
using namespace std;
int main() {
int n, m, q;
int x1, y1, x2, y2;
cin >> n >> m >> q;
//原数组
vector<vector<int>> arr(n + 1, vector<int> (m + 1));
//前缀和数组
vector<vector<long long>> dp(n + 1, vector<long long>(m + 1));
//填充原数组和前缀和数组
for(int i = 1; i <= n; i++)
{
for(int j = 1; j <= m; j++)
{
cin >> arr[i][j];
dp[i][j] = dp[i - 1][j] + dp[i][j - 1] - dp[i - 1][j - 1] + arr[i][j];
}
}
//使用前缀和数组
while(q--)
{
cin >> x1 >> y1 >> x2 >> y2;
cout << dp[x2][y2] - dp[x1 - 1][y2] - dp[x2][y1 - 1] + dp[x1 - 1][y1 - 1] << endl;
}
return 0;
}
// 64 位输出请用 printf("%lld")
查看9道真题和解析