Submission #471175

#	Time	Username	Problem	Language	Result	Execution time	Memory
471175		rainboy	Doktor (COCI17_doktor)	C11	100 / 100	89 ms	13096 KiB

doktor

#include <stdio.h>

#define N	500000

int main() {
	static int pp[N], qq[N], kk[N], ll[N + N];
	int n, i, i_, j_, k_;

	scanf("%d", &n);
	for (i = 0; i < n; i++) {
		scanf("%d", &pp[i]), pp[i]--;
		qq[pp[i]] = i;
		if (i == pp[i])
			kk[i]++;
	}
	for (i = 1; i < n; i++)
		kk[i] += kk[i - 1];
	i_ = j_ = k_ = -1;
	for (i = n - 1; i >= 0; i--) {
		int k;

		if (i <= pp[i]) {
			k = ++ll[i + pp[i]] - (kk[pp[i]] - (i == 0 ? 0 : kk[i - 1]));
			if (k_ < k)
				k_ = k, i_ = i, j_ = pp[i];
		}
		if (i != pp[i] && i <= qq[i]) {
			k = ++ll[i + qq[i]] - (kk[qq[i]] - (i == 0 ? 0 : kk[i - 1]));
			if (k_ < k)
				k_ = k, i_ = i, j_ = qq[i];
		}
	}
	printf("%d %d\n", pp[i_] + 1, pp[j_] + 1);
	return 0;
}

Compilation message (stderr)

doktor.c: In function 'main':
doktor.c:9:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
doktor.c:11:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |   scanf("%d", &pp[i]), pp[i]--;
      |   ^~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10