Submission #485893

#TimeUsernameProblemLanguageResultExecution timeMemory
485893rainboyČVENK (COI15_cvenk)C11
39 / 100
24 ms1588 KiB
#include <stdio.h> #define N 100000 #define X 512 #define L 29 int kk[X][X], n, x_, y_; int dfs1(int x, int y) { int k, k1, k2; if (x >= X || y >= X || (x & y) != 0) return 0; k1 = dfs1(x, y + 1), k2 = dfs1(x + 1, y), k = kk[x][y] + k1 + k2; if (k1 * 2 <= n && k2 * 2 <= n && (n - k) * 2 <= n) x_ = x, y_ = y; return k; } long long ans; void lca(int x1, int y1, int x2, int y2, int *x, int *y, int l) { if (l == 0) *x = 0, *y = 0; else { int n = 1 << l - 1; if (x1 >= n && y1 < n && x2 >= n && y2 < n) lca(x1 - n, y1, x2 - n, y2, x, y, l - 1), *x += n; else if (x1 < n && y1 >= n && x2 < n && y2 >= n) lca(x1, y1 - n, x2, y2 - n, x, y, l - 1), *y += n; else { if (x1 >= n && y1 < n) x1 = n - 1, y1 = 0; else if (x1 < n && y1 >= n) x1 = 0, y1 = n - 1; if (x2 >= n && y2 < n) x2 = n - 1, y2 = 0; else if (x2 < n && y2 >= n) x2 = 0, y2 = n - 1; lca(x1, y1, x2, y2, x, y, l - 1); } } } long long dist(int x1, int y1, int x2, int y2) { int x, y; lca(x1, y1, x2, y2, &x, &y, L); return (long long) (x1 + y1) + (x2 + y2) - (long long) (x + y) * 2; } int main() { static int xx[N], yy[N]; int i; scanf("%d", &n); if (n == 2) { scanf("%d%d%d%d", &xx[0], &yy[0], &xx[1], &yy[1]); printf("%lld\n", dist(xx[0], yy[0], xx[1], yy[1])); return 0; } for (i = 0; i < n; i++) { scanf("%d%d", &xx[i], &yy[i]); kk[xx[i]][yy[i]]++; } dfs1(0, 0); ans = 0; for (i = 0; i < n; i++) ans += dist(xx[i], yy[i], x_, y_); printf("%lld\n", ans); return 0; }

Compilation message (stderr)

cvenk.c: In function 'lca':
cvenk.c:26:18: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   26 |   int n = 1 << l - 1;
      |                ~~^~~
cvenk.c: In function 'main':
cvenk.c:57:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
cvenk.c:59:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |   scanf("%d%d%d%d", &xx[0], &yy[0], &xx[1], &yy[1]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cvenk.c:64:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |   scanf("%d%d", &xx[i], &yy[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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