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27 lines
635 B
27 lines
635 B
#include <bits/stdc++.h>
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using namespace std;
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const int N = 310;
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int a[N][N], s[N][N], dp[N];
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int n, ans;
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int main() {
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cin >> n;
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for (int i = 1; i <= n; i++)
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for (int j = 1; j <= n; j++) {
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cin >> a[i][j];
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s[i][j] = s[i - 1][j] + a[i][j];
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}
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for (int i = 1; i <= n; i++) {
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for (int k = 1; k <= i; k++) {
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for (int j = 1; j <= n; j++) {
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int gap = s[i][j] - s[i - k][j];
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dp[j] = max(dp[j - 1] + gap, gap);
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ans = max(dp[j], ans);
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}
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}
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}
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cout << ans;
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return 0;
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} |