제출 #703249

#제출 시각아이디문제언어결과실행 시간메모리
703249rainboyT-Covering (eJOI19_covering)C11
30 / 100
80 ms29516 KiB
#include <stdio.h> #include <string.h> #define NM 1000000 #define INF 0x3f3f3f3f int min(int a, int b) { return a < b ? a : b; } int di[] = { -1, 1, 0, 0 }; int dj[] = { 0, 0, -1, 1 }; int ds[NM], vv[NM], ee[NM], ww[NM]; int find(int i) { return ds[i] < 0 ? i : (ds[i] = find(ds[i])); } void join(int i, int j) { i = find(i); j = find(j); if (i == j) { ee[i]++; return; } if (ds[i] > ds[j]) ds[i] = j, vv[j] += vv[i], ee[j] += ee[i] + 1, ww[j] = min(ww[j], ww[i]); else { if (ds[i] == ds[j]) ds[i]--; ds[j] = i, vv[i] += vv[j], ee[i] += ee[j] + 1, ww[i] = min(ww[i], ww[j]); } } int main() { static int aa[NM], ej[NM][2], eo[NM]; int n, m, nm, k, h, i, j, ij; long long ans; scanf("%d%d", &n, &m), nm = n * m; for (i = 0; i < nm; i++) scanf("%d", &aa[i]); scanf("%d", &k); memset(ww, 0x3f, nm * sizeof *ww); ans = 0; while (k--) { scanf("%d%d", &i, &j), ij = i * m + j; ans += aa[ij]; for (h = 0; h < 4; h++) { int i_ = i + di[h], j_ = j + dj[h], ij_ = i_ * m + j_; if (i_ >= 0 && i_ < n && j_ >= 0 && j_ < m) { if (eo[ij_] == 2) { printf("No\n"); return 0; } ej[ij_][eo[ij_]++] = ij; ans += aa[ij_]; ww[ij] = min(ww[ij], aa[ij_]); } else { ans += -INF; ww[ij] = -INF; } } } memset(ds, -1, nm * sizeof *ds); for (i = 0; i < nm; i++) vv[i] = 1; for (i = 0; i < nm; i++) if (eo[i] == 2) join(ej[i][0], ej[i][1]), ans -= aa[i]; for (i = 0; i < nm; i++) if (ds[i] < 0) { if (vv[i] < ee[i]) { printf("No\n"); return 0; } if (vv[i] > ee[i] && ww[i] != INF) ans -= ww[i]; } if (ans < 0) { printf("No\n"); return 0; } printf("%lld\n", ans); return 0; }

컴파일 시 표준 에러 (stderr) 메시지

covering.c: In function 'main':
covering.c:39:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |  scanf("%d%d", &n, &m), nm = n * m;
      |  ^~~~~~~~~~~~~~~~~~~~~
covering.c:41:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |   scanf("%d", &aa[i]);
      |   ^~~~~~~~~~~~~~~~~~~
covering.c:42:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |  scanf("%d", &k);
      |  ^~~~~~~~~~~~~~~
covering.c:46:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |   scanf("%d%d", &i, &j), ij = i * m + j;
      |   ^~~~~~~~~~~~~~~~~~~~~
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