Submission #764610

#TimeUsernameProblemLanguageResultExecution timeMemory
764610rainboyLoop Town (CCO21_day2problem3)C11
25 / 25
881 ms51016 KiB
/* https://oj.uz/submission/497983 (user202729) */ #include <stdio.h> #define N 1000000 #define INF 0x3f3f3f3f3f3f3f3fLL long long max(long long a, long long b) { return a > b ? a : b; } unsigned int X = 12345; int rand_() { return (X *= 3) >> 1; } int *zz; void sort(int *ii, int l, int r) { while (l < r) { int i = l, j = l, k = r, i_ = ii[l + rand_() % (r - l)], tmp; while (j < k) if (zz[ii[j]] == zz[i_]) j++; else if (zz[ii[j]] < zz[i_]) { tmp = ii[i], ii[i] = ii[j], ii[j] = tmp; i++, j++; } else { k--; tmp = ii[j], ii[j] = ii[k], ii[k] = tmp; } sort(ii, l, i); l = k; } } int ft[N * 3]; void update(int i, int n, int x) { while (i < n) { ft[i] += x; i |= i + 1; } } int query(int i) { int x = 0; while (i >= 0) { x += ft[i]; i &= i + 1, i--; } return x; } int main() { static int xx[N], yy[N], pp[N], dd[N], ii[N]; int n, h, i; long long cnt, ans; scanf("%d%*d", &n); for (i = 0; i < n; i++) scanf("%d%d", &xx[i], &yy[i]); for (i = 0; i < n; i++) ii[i] = i; zz = xx, sort(ii, 0, n); for (i = 0; i < n; i++) xx[ii[i]] = i; zz = yy, sort(ii, 0, n); for (i = 0; i < n; i++) yy[ii[i]] = i; for (i = 0; i < n; i++) pp[xx[i]] = yy[i]; for (i = 0; i < n; i++) if (pp[i] < i) pp[i] += n; cnt = 0; for (i = 0; i < n; i++) { cnt += query(pp[i]) - query(pp[i] - n); update(pp[i], n * 3, 1); } for (i = 0; i < n; i++) dd[i] = pp[i] - i; zz = dd, sort(ii, 0, n); ans = cnt; for (h = 0; h < n; h++) { i = ii[h]; update(pp[i], n * 3, -1); cnt += n - 1; cnt -= query(pp[i]) * 2; cnt -= (n - 1 - i - (query(n * 3 - 1) - query(n + pp[i]))) * 2; ans = max(ans, cnt); update(n + pp[i], n * 3, 1); } ans = (long long) n * (n - 1) / 2 - ans; printf("%lld\n", ans); return 0; }

Compilation message (stderr)

Main.c: In function 'main':
Main.c:60:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |  scanf("%d%*d", &n);
      |  ^~~~~~~~~~~~~~~~~~
Main.c:62:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |   scanf("%d%d", &xx[i], &yy[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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