Submission #1404308

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
int pw[(1<<15)+3];
void pre(){
	for(int i=0;i<16;i++) pw[1<<i]=i;
}
int pos(int val){
	val=val&(-val);
	if((val>>16)==0) return pw[val];
	else return 16+pw[val];
}
int n,tot;
vector<int> v[35];
int main(){
	scanf("%d",&n);pre();
	for(int i=1,t;i<=n;i++){
		scanf("%d",&t);
		tot^=t;v[pos(t)].push_back(t);
	}
	int ans=0;
	for(int i=30;i>=0;i--){
		if((tot>>i)&1){
			if(v[i].size()==0) return puts("-1"),0;
			int t=v[i][0]-1;tot=tot^(t+1)^t;
			ans++;
		}
	}
	cout<<ans<<endl;
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:15:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);pre();
                ^
./Main.cpp:17:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&t);
                 ^

Judge Result