Submission #1001372

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
int n, a[100009], b[100009];
int main() {
	scanf("%d", &n);
	for(int i = 0; i < n; i++) scanf("%d", &a[i]);
	bool flag = true;
	for(int i = 30; i >= 0 && flag; i--) {
		int s = 0;
		for(int j = 0; j < n; j++) s ^= (a[j] >> i) & 1;
		if(s == 1) {
			bool ok = false;
			for(int j = 0; j < n && !ok; j++) {
				if(!b[j] && a[j] >> i << i == a[j]) {
					a[j]--;
					b[j] = 1;
					ok = true;
				}
			}
			if(!ok) flag = false;
		}
	}
	if(!flag) printf("-1\n");
	else {
		int ret = 0;
		for(int i = 0; i < n; i++) ret += b[i];
		printf("%d\n", ret);
	}
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:5:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
./Main.cpp:6:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  for(int i = 0; i < n; i++) scanf("%d", &a[i]);
                                               ^

Judge Result