Submission #706780

#TimeUsernameProblemLanguageResultExecution timeMemory
706780rainboyParking (CEOI22_parking)C11
0 / 100
36 ms2928 KiB
#include <stdio.h> #define N 200000 #define M 200000 #define INF 0x3f3f3f3f int min(int a, int b) { return a < b ? a : b; } int ij[M * 2], eh[N][2], eo[N]; int solve1(int *aa, int n) { int i, k, k_; k = 0; for (i = 0; i < n; i++) if (aa[i] == 1) k++; k_ = INF; for (i = 0; i < n; i++) { if (aa[i] == 1) k--; k_ = min(k_, k); if (aa[i] == 0) k++; } return k_; } int solve2(int *aa, int n) { static int bb[N]; int i, j, k_; k_ = INF; for (i = 0; i < n; i++) { for (j = 0; j < n; j++) bb[j] = aa[(i + j) % n]; k_ = min(k_, solve1(bb, n) + 1); } return k_; } int main() { static char visited[N]; static int aa[N]; int n, m, h, h_, i, i_, j, k, c, d, cnt, o; scanf("%d%d", &n, &m); k = 0, d = n; for (h = 0; h < m; h++) { scanf("%d%d", &i, &j), i--, j--; if (i == -1) k++; else if (j != -1) { if (i != j) { ij[h << 1 | 0] = i, ij[h << 1 | 1] = j; eh[i][eo[i]++] = h << 1 | 0, eh[j][eo[j]++] = h << 1 | 1; } else d--; } } cnt = d; for (i = 0; i < n; i++) if (eo[i] == 1 && !visited[i]) { h_ = -1, i_ = i, m = 0; do { visited[i_] = 1; for (o = eo[i_]; o--; ) { h = eh[i_][o], j = ij[h ^ 1]; if (h != (h_ ^ 1)) { aa[m++] = h & 1; h_ = h, i_ = j; break; } } } while (eo[i_] != 1); visited[i_] = 1; c = solve1(aa, m); if (k == 0 && c > 0) { printf("-1\n"); return 0; } cnt += c, k++; } for (i = 0; i < n; i++) if (eo[i] == 2 && !visited[i]) { h_ = -1, i_ = i, m = 0; do { visited[i_] = 1; for (o = eo[i_]; o--; ) { h = eh[i_][o], j = ij[h ^ 1]; if (h != (h_ ^ 1)) { aa[m++] = h & 1; h_ = h, i_ = j; break; } } } while (i_ != i); if (k == 0) { printf("-1\n"); return 0; } c = solve2(aa, m); if (k == 1 && c > 1) { printf("-1\n"); return 0; } cnt += c; } printf("%d\n", cnt); return 0; }

Compilation message (stderr)

Main.c: In function 'main':
Main.c:47:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |  scanf("%d%d", &n, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~
Main.c:50:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |   scanf("%d%d", &i, &j), i--, j--;
      |   ^~~~~~~~~~~~~~~~~~~~~
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...