#pragma GCC optimize("O3,unroll-loops")
#include "wombats.h"
#include <cstdio>
#include <cstdlib>
#include <set>
#include <algorithm>
#include <cstring>
#include <vector>
#include <cassert>
using namespace std;
#ifndef ROW
#define ROW 5000
#endif
int r, c, h[ROW][100], v[ROW][100];
int ans[100][100], ansrev[100][100];
void calc_ii(int ii) {
static int dp[2][100];
/* find answer for (V1, V2) where V1 = ii */
memset(dp[0], 63, sizeof dp[0]);
dp[0][ii] = 0;
int I = 0;
for (int i = 0; i < r; ++i, I ^= 1) {
static int pre[100], suf[100], ph[100]; /* annoying ahh math */
ph[0] = 0;
for (int j = 0; j + 1 < c; ++j)
ph[j + 1] = ph[j] + h[i][j];
pre[0] = dp[I][0];
for (int j = 1; j < c; ++j) pre[j] = min(pre[j - 1], dp[I][j] - ph[j]);
suf[c - 1] = dp[I][c - 1] + ph[c - 1];
for (int j = c - 2; j >= 0; --j) suf[j] = min(suf[j + 1], dp[I][j] + ph[j]);
for (int j = 0; j < c; ++j)
dp[I][j] = min(ph[j] + pre[j], suf[j] - ph[j]);
for (int j = 0; j < c; ++j)
dp[!I][j] = dp[I][j] + v[i][j];
}
for (int jj = 0; jj < c; ++jj) ans[ii][jj] = dp[(r - 1) & 1][jj];
vis[ii] = 1;
}
void calcrev_ii(int ii) {
static int dp[2][100];
/* find answer for (V1, V2) where V2 = ii */
memset(dp[0], 63, sizeof dp[0]);
dp[0][ii] = 0;
int I = 0;
for (int i = r - 1; i >= 0; --i, I ^= 1) {
static int pre[100], suf[100], ph[100]; /* annoying ahh math */
ph[0] = 0;
for (int j = 0; j + 1 < c; ++j)
ph[j + 1] = ph[j] + h[i][j];
pre[0] = dp[I][0];
for (int j = 1; j < c; ++j) pre[j] = min(pre[j - 1], dp[I][j] - ph[j]);
suf[c - 1] = dp[I][c - 1] + ph[c - 1];
for (int j = c - 2; j >= 0; --j) suf[j] = min(suf[j + 1], dp[I][j] + ph[j]);
for (int j = 0; j < c; ++j)
dp[I][j] = min(ph[j] + pre[j], suf[j] - ph[j]);
if (i)
for (int j = 0; j < c; ++j)
dp[!I][j] = dp[I][j] + v[i - 1][j];
}
for (int jj = 0; jj < c; ++jj) ans[jj][ii] = dp[!I][jj];
visrev[ii] = 1;
}
void changeH(int P, int Q, int W) {
h[P][Q] = W;
memset(ans, -1, sizeof ans);
}
void changeV(int P, int Q, int W) {
v[P][Q] = W;
memset(ans, -1, sizeof ans);
}
void init(int R, int C, int H[ROW][200], int V[ROW][200]) {
srand(868686);
r = R, c = C;
for (int i = 0; i + 1 < r; ++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 + 1 < c; ++j)
h[i][j] = H[i][j];
for (int i = 0; i < c; ++i) vis[i] = 0, visrev[i] = 0;
}
int escape(int V1, int V2) {
if (ans[V1][V2] != -1) return ans[V1][V2];
if (rand() & 1)
calc_ii(V1);
else
calcrev_ii(V2);
return ans[V1][V2];
}
Compilation message
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 calc_ii(int)':
wombats.cpp:43:2: error: 'vis' was not declared in this scope
43 | vis[ii] = 1;
| ^~~
wombats.cpp: In function 'void calcrev_ii(int)':
wombats.cpp:70:2: error: 'visrev' was not declared in this scope; did you mean 'ansrev'?
70 | visrev[ii] = 1;
| ^~~~~~
| ansrev
wombats.cpp: In function 'void init(int, int, int (*)[200], int (*)[200])':
wombats.cpp:91:30: error: 'vis' was not declared in this scope
91 | for (int i = 0; i < c; ++i) vis[i] = 0, visrev[i] = 0;
| ^~~
wombats.cpp:91:42: error: 'visrev' was not declared in this scope; did you mean 'ansrev'?
91 | for (int i = 0; i < c; ++i) vis[i] = 0, visrev[i] = 0;
| ^~~~~~
| ansrev
