Submission #840479

#	Time	Username	Problem	Language	Result	Execution time	Memory
840479		overwatch9	Raisins (IOI09_raisins)	C++17	100 / 100	154 ms	25948 KiB

raisins

#include <iostream>
#include <vector>
using namespace std;
vector <vector <int>> grid;
vector <vector <int>> pfx;
const int maxn = 50 + 1;
int dp[maxn][maxn][maxn][maxn];
int solve(int r1, int r2, int c1, int c2) {
    if (r1 == r2 && c1 == c2)
        return 0;
    if (dp[r1][r2][c1][c2] != -1)
        return dp[r1][r2][c1][c2];
    int ans = 1e9;
    int x = pfx[r2][c2] - pfx[r2][c1-1] - pfx[r1-1][c2] + pfx[r1-1][c1-1];
    for (int i = r1; i < r2; i++) {
        ans = min(ans, solve(r1, i, c1, c2) + solve(i+1, r2, c1, c2) + x);
    }
    for (int i = c1; i < c2; i++) {
        ans = min(ans, solve(r1, r2, c1, i) + solve(r1, r2, i+1, c2) + x);
    }
    dp[r1][r2][c1][c2] = ans;
    return ans;
}
int main() {
    int n, m;
    cin >> n >> m;
    grid = pfx = vector <vector <int>> (n+1, vector <int> (m+1));
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++)
            cin >> grid[i][j];
    }
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= n; j++) {
            for (int l = 1; l <= m; l++) {
                for (int k = 1; k <= m; k++)
                    dp[i][j][l][k] = -1;
            }
        }
    }

    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            pfx[i][j] = grid[i][j];
            pfx[i][j] += pfx[i-1][j] + pfx[i][j-1] - pfx[i-1][j-1];
        }
    }

    cout << solve(1, n, 1, m) << '\n';
}

• Subtask 1: 100 / 100