Submission #1632763

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Source Code Expand

#include <bits/stdc++.h>
#define mset(a,b) memset(a,b,sizeof a)
#define mcpy(a,b) memcpy(a,b,sizeof b)
#define lb(x) ((x)&(-(x)))
#define xx first
#define yy second
#define pb push_back
#define mp make_pair
#define pii pair<int,int> 
#define dalao 1000000007
#define inf 0x3f3f3f3f
#define N 305
using namespace std;
typedef long long ll;
int n,a[N],s,ans;
int main(){
	scanf("%d",&n);
	for(int i=1;i<=n;i++)scanf("%d",&a[i]),s^=a[i];
	for(int i=29;~i;i--)if(s>>i&1)
		for(int j=1;j<=n;j++)if(lb(a[j])==1<<i){ans++,s^=(1<<i+1)-1;break;}
	if(s)puts("-1");else cout<<ans;
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:17:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
./Main.cpp:18:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1;i<=n;i++)scanf("%d",&a[i]),s^=a[i];
                                                ^

Judge Result