Submission #252340

#	Time	Username	Problem	Language	Result	Execution time	Memory
252340		SamAnd	Raisins (IOI09_raisins)	C++17	100 / 100	712 ms	30484 KiB

raisins

#include <bits/stdc++.h>
using namespace std;
const int N = 55, INF = 1000000009;

int n, m;
int a[N][N];

int p[N][N];
void pre()
{
    for (int i = 1; i <= n; ++i)
    {
        for (int j = 1; j <= m; ++j)
        {
            p[i][j] = p[i - 1][j] + p[i][j - 1] - p[i - 1][j - 1] + a[i][j];
        }
    }
}

int sum(int x1, int y1, int x2, int y2)
{
    return p[x2][y2] - p[x1 - 1][y2] - p[x2][y1 - 1] + p[x1 - 1][y1 - 1];
}

bool c[N][N][N][N];
int dp[N][N][N][N];
int rec(int x1, int y1, int x2, int y2)
{
    if (c[x1][y1][x2][y2])
        return dp[x1][y1][x2][y2];
    c[x1][y1][x2][y2] = true;
    if (x1 == x2 && y1 == y2)
        return 0;
    dp[x1][y1][x2][y2] = INF;
    int s = sum(x1, y1, x2, y2);
    for (int i = x1; i < x2; ++i)
        dp[x1][y1][x2][y2] = min(dp[x1][y1][x2][y2], s + rec(x1, y1, i, y2) + rec(i + 1, y1, x2, y2));
    for (int j = y1; j < y2; ++j)
        dp[x1][y1][x2][y2] = min(dp[x1][y1][x2][y2], s + rec(x1, y1, x2, j) + rec(x1, j + 1, x2, y2));
    return dp[x1][y1][x2][y2];
}

int main()
{
    #ifdef SOMETHING
    freopen("input.txt", "r", stdin);
    #endif // SOMETHING
    scanf("%d%d", &n, &m);
    for (int i = 1; i <= n; ++i)
    {
        for (int j = 1; j <= m; ++j)
            scanf("%d", &a[i][j]);
    }
    pre();
    printf("%d\n", rec(1, 1, n, m));
    return 0;
}

Compilation message (stderr)

raisins.cpp: In function 'int main()':
raisins.cpp:48:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~
raisins.cpp:52:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d", &a[i][j]);
             ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100