题目描述
blablabla
样例
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include[HTML_REMOVED]
include[HTML_REMOVED]
include[HTML_REMOVED]
using namespace std;
const int N = 1010;
typedef long long ll;
int arr[N][N];
ll sum[N][N];
int n, m, q;
int main() {
cin >> n >> m>>q;
for (int i = 1; i <= n; i) {
for (int j = 1; j <= m; j) {
cin >> arr[i][j];
sum[i][j] = sum[i][j - 1] + arr[i][j];
}
}
int x1, x2, y1, y2;
ll summ = 0;
while (q--) {
summ = 0;
cin >> x1 >> y1 >> x2 >> y2;
for (int i = x1; i <= x2; i++) {
summ += sum[i][y2] - sum[i][y1 - 1];
}
cout << summ << endl;
}
return 0;
}
算法1
(暴力枚举) $O(n^2)$
blablabla
时间复杂度
参考文献
C++ 代码
blablabla
算法2
(暴力枚举) $O(n^2)$
blablabla
时间复杂度
参考文献
C++ 代码
blablabla