제출 #528287

#제출 시각아이디문제언어결과실행 시간메모리
528287rainboyIzbori (COCI22_izbori)C11
40 / 110
3002 ms3652 KiB
#include <stdio.h>
#include <string.h>

#define N	200000

unsigned int X = 12345;

int rand_() {
	return (X *= 3) >> 1;
}

int aa[N], ii[N];

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) {
			int c = aa[ii[j]] != aa[i_] ? aa[ii[j]] - aa[i_] : ii[j] - i_;

			if (c == 0)
				j++;
			else if (c < 0) {
				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 main() {
	static int kk[N * 2 + 1];
	static char marked[N];
	int n, h, i, j, d, k;
	long long ans;

	scanf("%d", &n);
	for (i = 0; i < n; i++) {
		scanf("%d", &aa[i]);
		ii[i] = i;
	}
	sort(ii, 0, n);
	ans = 0;
	for (i = 0; i < n; i = j) {
		j = i + 1;
		while (j < n && aa[ii[j]] == aa[ii[i]])
			j++;
		memset(marked, 0, n * sizeof *marked);
		for (h = i; h < j; h++)
			marked[ii[h]] = 1;
		memset(kk, 0, (n * 2 + 1) * sizeof *kk);
		d = n, kk[d] = 1, k = 0;
		for (i = 0; i < n; i++)
			if (marked[i]) {
				k += kk[d];
				ans += k;
				d++, kk[d]++;
			} else {
				d--;
				k -= kk[d];
				ans += k;
				kk[d]++;
			}
	}
	printf("%lld\n", ans);
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

Main.c: In function 'main':
Main.c:42:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
Main.c:44:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |   scanf("%d", &aa[i]);
      |   ^~~~~~~~~~~~~~~~~~~
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