Submission #420519

#	Time	Username	Problem	Language	Result	Execution time	Memory
420519		arayi	Wombats (IOI13_wombats)	C++17	55 / 100	20055 ms	41416 KiB

wombats

#include "wombats.h"
#include <bits/stdc++.h>
#define lli long long
using namespace std;


int n, m;
lli h[5002][201], v[5002][201];
lli dp[5002][201], pr[201];
void upd(int v1)
{
    for(int i = 0; i < m; i++) dp[n - 1][i] = 1e17;
    dp[n - 1][v1] = 0;
    for(int i = n - 2; i >= 0; i--)
    {
        pr[0] = 0;
        for(int j = 0; j < m - 1; j++)
            pr[j + 1] = pr[j] + h[i + 1][j];
        lli mn = dp[i + 1][0] + pr[m - 1];
        for(int j = 0; j < m; j++)
        {
            mn = min(mn, dp[i + 1][j] + pr[m - 1] - pr[j]);
            dp[i][j] = mn - (pr[m - 1] - pr[j]) + v[i][j];
        }
        mn = dp[i + 1][m - 1] + pr[m - 1];
        for(int j = m - 1; j >= 0; j--)
        {
            mn = min(mn, dp[i + 1][j] + pr[j]);
            dp[i][j] = min(dp[i][j], mn - pr[j] + v[i][j]);
        }
    }
}
void init(int R, int C, int H[5000][200], int V[5000][200]) {
    n = R; m = C;
    for(int i = 0; i < n; i++)
        for(int j = 0; j < m; j++) h[i][j] = H[i][j], v[i][j]= V[i][j];
}

void changeH(int P, int Q, int W) {
    h[P][Q] = W;
}

void changeV(int P, int Q, int W) {
    v[P][Q] = W;
}

int escape(int V1, int V2) {
    upd(V2);
    lli mn = dp[0][V1], sm = 0;
    for(int i = V1; i < m - 1; i++)
    {
        sm += h[0][i];
        mn = min(mn, dp[0][i + 1] + sm);
    }
    sm = 0;
    for(int i = V1 - 1; i >= 0; i--)
    {
        sm += h[0][i];
        mn = min(mn, dp[0][i] + sm);
    }
    return mn;
}

Compilation message (stderr)

grader.c: In function 'int main()':
grader.c:15:6: warning: variable 'res' set but not used [-Wunused-but-set-variable]
   15 |  int res;
      |      ^~~

• Subtask 1: 9 / 9
• Subtask 2: 12 / 12
• Subtask 3: 16 / 16
• Subtask 4: 18 / 18
• Subtask 5: 0 / 21
• Subtask 6: 0 / 24