Submission #1247829

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Source Code Expand

#include <bits/stdc++.h>
      
#define FOR(i,a,b) for( ll i = (a); i < (ll)(b); i++ )
#define REP(i,n) FOR(i,0,n)
#define YYS(x,arr) for(auto& x:arr)
#define ALL(x) (x).begin(),(x).end()
#define SORT(x) sort( (x).begin(),(x).end() )
#define REVERSE(x) reverse( (x).begin(),(x).end() )
#define UNIQUE(x) (x).erase( unique( ALL( (x) ) ) , (x).end() )
#define PW(x) (1LL<<(x))
#define SZ(x) ((ll)(x).size())
#define SHOW(x) cout << #x << " = " << x << endl
#define SHOWA(x,n) for( int yui = 0; yui < n; yui++ ){ cout << x[yui] << " "; } cout << endl

#define pb emplace_back
#define fi first
#define se second

using namespace std;

typedef long double ld;
typedef long long int ll;
typedef pair<int,int> pi;
typedef pair<ll,ll> pl;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<bool> vb;
typedef vector<ld> vd;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
typedef vector<vpl> gr;
typedef vector<vl> ml;
typedef vector<vd> md;
typedef vector<vi> mi;
     
const ll INF = (ll)1e9 + 10;
const ll INFLL = (ll)1e18 + 10;
const ld EPS = 1e-12;
const ll MOD = 1e9+7;
     
template<class T> T &chmin( T &a , const T &b ){ return a = min(a,b); }
template<class T> T &chmax( T &a , const T &b ){ return a = max(a,b); }
template<class T> inline T sq( T a ){ return a * a; }

ll in(){ long long int x; scanf( "%lld" , &x ); return x; }
char yuyushiki[1000010]; string stin(){ scanf( "%s" , yuyushiki ); return yuyushiki; }

// head

int n;
int a[100010];

int ans;
int res;

bool r[64];

int main(){

  n = in();
  REP( i , n ){
    a[i] = in();
    res ^= a[i];
    REP( j , 32 ){
      if( a[i] & PW(j) ){
        r[j] = true;
        break;
      }
    }
  }
  
  for( int i = 30; i >= 0; i-- ){
    if( res & PW(i) ){
      if( r[i] ){
        ans++;
        res = res ^ ( PW(i) - 1 );
      } else {
        puts( "-1" );
        return 0;
      }
    }
  }

  cout << ans << endl;

  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘ll in()’:
./Main.cpp:45:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 ll in(){ long long int x; scanf( "%lld" , &x ); return x; }
                                               ^
./Main.cpp: In function ‘std::string stin()’:
./Main.cpp:46:66: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 char yuyushiki[1000010]; string stin(){ scanf( "%s" , yuyushiki ); return yuyushiki; }
                                                                  ^

Judge Result