Submission #1071622

#TimeUsernameProblemLanguageResultExecution timeMemory
1071622rainboyTreasure Hunt (CCO24_day1problem1)C11
25 / 25
1107 ms138580 KiB
#include <stdio.h> #include <stdlib.h> #define N 1000000 int *ej[N], *ew[N], eo[N]; void append(int i, int j, int w) { int o = eo[i]++; if (o >= 2 && (o & o - 1) == 0) { ej[i] = (int *) realloc(ej[i], o * 2 * sizeof *ej[i]); ew[i] = (int *) realloc(ew[i], o * 2 * sizeof *ew[i]); } ej[i][o] = j, ew[i][o] = w; } int aa[N], iq[N + 1], pq[N], cnt; int lt(int i, int j) { return aa[i] > aa[j]; } int p2(int p) { return (p *= 2) > cnt ? 0 : (p < cnt && lt(iq[p + 1], iq[p]) ? p + 1 : p); } void pq_up(int i) { int p, q, j; for (p = pq[i]; (q = p / 2) && lt(i, j = iq[q]); p = q) iq[pq[j] = p] = j; iq[pq[i] = p] = i; } void pq_dn(int i) { int p, q, j; for (p = pq[i]; (q = p2(p)) && lt(j = iq[q], i); p = q) iq[pq[j] = p] = j; iq[pq[i] = p] = i; } void pq_add_last(int i) { iq[pq[i] = ++cnt] = i; } int pq_remove_first() { int i = iq[1], j = iq[cnt--]; if (j != i) pq[j] = 1, pq_dn(j); pq[i] = 0; return i; } int main() { int n, m, h, i, j, o, w; scanf("%d%d", &n, &m); for (i = 0; i < n; i++) scanf("%d", &aa[i]); for (i = 0; i < n; i++) { ej[i] = (int *) malloc(2 * sizeof *ej[i]); ew[i] = (int *) malloc(2 * sizeof *ew[i]); } for (h = 0; h < m; h++) { scanf("%d%d%d", &i, &j, &w), i--, j--; append(i, j, w), append(j, i, w); } for (i = 0; i < n; i++) pq_add_last(i); for (h = cnt / 2; h > 0; h--) pq_dn(iq[h]); while (cnt) { i = pq_remove_first(); for (o = eo[i]; o--; ) { j = ej[i][o], w = ew[i][o]; if (aa[j] < aa[i] - w) aa[j] = aa[i] - w, pq_up(j); } } for (i = 0; i < n; i++) printf("%d\n", aa[i]); return 0; }

Compilation message (stderr)

Main.c: In function 'append':
Main.c:11:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   11 |  if (o >= 2 && (o & o - 1) == 0) {
      |                     ~~^~~
Main.c: In function 'main':
Main.c:58:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   58 |  scanf("%d%d", &n, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~
Main.c:60:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |   scanf("%d", &aa[i]);
      |   ^~~~~~~~~~~~~~~~~~~
Main.c:66:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |   scanf("%d%d%d", &i, &j, &w), i--, j--;
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~
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