Submission #2738524

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Source Code Expand

#include <stdio.h>
#include <stdlib.h>

int compare(const void *a, const void *b){
	return *(int *)b - *(int *)a;
}

int main(){
	int N, i, x = 0, ans = 0;
	scanf("%d", &N);
	int *a = (int *)malloc(sizeof(int) * N);
	for(i = 0; i < N; i++){
		scanf("%d", &a[i]);
		x ^= a[i];
		a[i] ^= a[i] - 1;
	}
	if(x == 0){
		printf("0\n");
		return 0;
	}
	qsort(a, N, sizeof(int), compare);
	for(i = 0; i < N; i++){
		if((x ^ a[i]) < x && (x ^ a[i]) < a[i]){
			x ^= a[i];
			ans++;
			if(x == 0){
				printf("%d\n", ans);
				return 0;
			}
		}
	}
	printf("-1\n");
	return 0;
}

Submission Info

Compile Error

./Main.c: In function ‘main’:
./Main.c:10:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &N);
  ^
./Main.c:13:3: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i]);
   ^

Judge Result