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OI-codes/Luogu/P1130/P1130.cpp

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#include <bits/stdc++.h>
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using namespace std;
int main() {
long long n, m, a[2005][2005], f[2005][2005];
cin >> n >> m;
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for (int i = 1; i <= m; i++) {
for (int j = 1; j <= n; j++) {
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cin >> a[j][i];
}
}
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for (int i = 1; i <= n; i++) {
f[i - 1][0] = f[i - 1][m];
for (int j = 1; j <= m; j++) {
f[i][j] = a[i][j] + min(f[i - 1][j], f[i - 1][j - 1]);
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}
}
long long ans = f[n][1];
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for (int i = 2; i <= m; i++) {
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ans = min(ans, f[n][i]);
}
cout << ans << endl;
return 0;
}