Submission #2835851


Source Code Expand

#include <bits/stdc++.h>
using namespace std;
/*{{{*/  //template
#define rep(i,n) for(int i=0;i<(int)(n);i++)
constexpr int INF = numeric_limits<int>::max()/2;
constexpr long long LINF = numeric_limits<long long>::max()/3;
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define fi first
#define se second
#define all(v) (v).begin(),(v).end()
#define sz(x) (int)(x).size()
#define debug(x) cerr<<#x<<":"<<x<<endl
#define debug2(x,y) cerr<<#x<<","<<#y":"<<x<<","<<y<<endl
//struct fin{ fin(){ cin.tie(0); ios::sync_with_stdio(false); } } fin_;
struct Double{ double d; explicit Double(double x) : d(x){} };
ostream& operator<<(ostream& os,const Double x){ os << fixed << setprecision(20) << x.d; return os; }
template<typename T> ostream& operator<<(ostream& os,const vector<T>& vec){ os << "["; for(const auto& v : vec){ os << v << ","; } os << "]"; return os; }
template<typename T,typename U> ostream& operator<<(ostream& os,const pair<T,U>& p){ os << "(" << p.first << ","<< p.second <<")"; return os; }
template<typename T> ostream& operator<<(ostream& os,const set<T>& st){ os<<"{"; for(T v:st) os<<v<<","; os <<"}"; return os; }
template<typename T,typename U> inline void chmax(T &x,U y){ if(y>x) x = y; }
template<typename T,typename U> inline void chmin(T &x,U y){ if(y<x) x = y; }
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;
ll gcd(ll a,ll b){ if(b==0) return a; else return gcd(b,a%b); }
//constexpr double eps = 1e-14; 
constexpr double eps = 1e-10; 
constexpr ll mod = 1e9+7;
const int dx[]={1,0,-1,0} ,dy[] = {0,1,0,-1};
/*}}}*/

int main(){
    int N; cin >> N;
    ll x=0;
    vector<ll> a(N);
    rep(i,N) cin >> a[i];
    rep(i,N) x ^= a[i];

    set<int> st;
    rep(i,N){
        ll t = a[i] ^ (a[i] - 1);
        st.insert(__builtin_popcount(t));
    }

    int ans = 0;
    for(int i=30;i>=0;i--){
        if((x>>i) & 1){
            if(st.count(i+1)){
                x ^= (1 << (i+1)) - 1;
                ans++;
            }
        }
    }

    if(x != 0){
        cout << -1 << endl;
    }else{
        cout << ans << endl;
    }
}

Submission Info

Submission Time
Task C - Cheating Nim
User chakku000
Language C++14 (GCC 5.4.1)
Score 500
Code Size 2228 Byte
Status AC
Exec Time 44 ms
Memory 1024 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 500 / 500
Status
AC × 2
AC × 26
Set Name Test Cases
Sample example0.txt, example1.txt
All 000.txt, 001.txt, 002.txt, 003.txt, 004.txt, 005.txt, 006.txt, 007.txt, 008.txt, 009.txt, 010.txt, 011.txt, 012.txt, 013.txt, 014.txt, 015.txt, 016.txt, 017.txt, 018.txt, 019.txt, 020.txt, 021.txt, 022.txt, 023.txt, example0.txt, example1.txt
Case Name Status Exec Time Memory
000.txt AC 1 ms 256 KB
001.txt AC 1 ms 256 KB
002.txt AC 44 ms 1024 KB
003.txt AC 15 ms 768 KB
004.txt AC 16 ms 640 KB
005.txt AC 13 ms 512 KB
006.txt AC 43 ms 1024 KB
007.txt AC 43 ms 1024 KB
008.txt AC 43 ms 1024 KB
009.txt AC 43 ms 1024 KB
010.txt AC 43 ms 1024 KB
011.txt AC 43 ms 1024 KB
012.txt AC 43 ms 1024 KB
013.txt AC 44 ms 1024 KB
014.txt AC 43 ms 1024 KB
015.txt AC 43 ms 1024 KB
016.txt AC 43 ms 1024 KB
017.txt AC 43 ms 1024 KB
018.txt AC 43 ms 1024 KB
019.txt AC 43 ms 1024 KB
020.txt AC 43 ms 1024 KB
021.txt AC 5 ms 256 KB
022.txt AC 5 ms 384 KB
023.txt AC 41 ms 1024 KB
example0.txt AC 1 ms 256 KB
example1.txt AC 1 ms 256 KB