Submission #480101

#	Time	Username	Problem	Language	Result	Execution time	Memory
480101		rainboy	Trobojnica (COCI19_trobojnica)	C11	110 / 110	47 ms	3552 KiB

trobojnica

#include <stdio.h>

#define N	200000

int main() {
	static char cc[N + 1];
	static int kk[4], ii[N];
	int n, i, x, cnt;

	scanf("%d%s", &n, cc);
	x = 0;
	for (i = 0; i < n; i++) {
		cc[i] -= '0';
		kk[(int) cc[i]]++;
		x ^= cc[i];
	}
	if (x != 0 || kk[1] == n || kk[2] == n || kk[3] == n) {
		printf("NE\n");
		return 0;
	}
	cnt = 0;
	ii[cnt++] = 0;
	printf("DA\n");
	for (i = 1; i < n; i++) {
		int a, b;

		while (cnt >= 2 && (a = cc[ii[cnt - 2]]) != (b = cc[ii[cnt - 1]]) && (kk[a] > 1 || kk[b] > 1)) {
			kk[a]--, kk[b]--, kk[a ^ b]++, cnt--;
			cc[ii[cnt - 1]] = a ^ b;
			printf("%d %d %d\n", ii[cnt - 1] + 1, i + 1, a ^ b);
		}
		ii[cnt++] = i;
	}
	return 0;
}

Compilation message (stderr)

trobojnica.c: In function 'main':
trobojnica.c:10:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |  scanf("%d%s", &n, cc);
      |  ^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 50 / 50