Submission #962146

#	Time	Username	Problem	Language	Result	Execution time	Memory
962146		danikoynov	Wombats (IOI13_wombats)	C++14	55 / 100	20087 ms	26560 KiB

wombats

#include "wombats.h"
#include<bits/stdc++.h>

using namespace std;

const int maxr = 5010, maxc = 210;

void precalculate();
int h[maxr][maxc], v[maxr][maxc], dp[maxc][2][maxc];
int r, c;
void init(int R, int C, int H[5000][200], int V[5000][200]) {
    /* ... */
    r = R;
    c = C;
    for (int i = 0; i < R - 1; i ++)
     for (int j = 0; j < C; j ++)
     v[i][j] = V[i][j];

    for (int i = 0; i < R; i ++)
     for (int j = 0; j < C - 1; j ++)
     h[i][j] = H[i][j];

     precalculate();
}

const int inf = 2e9 + 10;

void fix_row(int d, int i)
{
     for (int j = 1; j < c; j ++)
     {
          dp[d][i & 1][j] = min(dp[d][i & 1][j], dp[d][i & 1][j - 1] + h[i][j - 1]);
     }
     for (int j = c - 2; j >= 0; j --)
     {
          dp[d][i & 1][j] = min(dp[d][i & 1][j], dp[d][i & 1][j + 1] + h[i][j]);
     }
}

void calc_dp(int d)
{
     for (int i = 0; i < 2; i  ++)
          for (int j = 0; j < c; j ++)
          dp[d][i][j] = inf;

     dp[d][0][d] = 0;
     fix_row(d, 0);

     for (int i = 1; i < r; i ++)
     {
          for (int j = 0; j < c; j ++)
          {
               dp[d][i & 1][j] = dp[d][(i - 1) & 1][j] + v[i - 1][j];
          }
          fix_row(d, i);
     }
}

void precalculate()
{
     for (int d = 0; d < c; d ++)
          calc_dp(d);
}
void changeH(int P, int Q, int W) {
    /* ... */
    h[P][Q] = W;
    precalculate();
}

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

int escape(int V1, int V2)
{
     return dp[V1][(r - 1) & 1][V2];
}

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;
      |      ^~~
wombats.cpp: In function 'void init(int, int, int (*)[200], int (*)[200])':
wombats.cpp:19:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   19 |     for (int i = 0; i < R; i ++)
      |     ^~~
wombats.cpp:23:6: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   23 |      precalculate();
      |      ^~~~~~~~~~~~

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