Submission #1678313


Source Code Expand

//------------------------------>> tsukasa_diary's template <<------------------------------//
#include <bits/stdc++.h>
using namespace std;

#define for_(i,a,b) for(int i=(a);i<(b);++i)
#define for_rev(i,a,b) for(int i=(a);i>=(b);--i)
#define allof(a) (a).begin(),(a).end()
#define minit(a,b) memset(a,b,sizeof(a))

using lint = long long;
using pii = pair< int, int >;

template< typename T > using Vec = vector< T >;

template< typename T > bool in_range(T x, T lb, T ub) { return lb <= x && x < ub; }
template< typename T > bool in_range(T x, T y, T lb, T ub) { return in_range(x, lb, ub) && in_range(y, lb, ub); }

template< typename T > void modAdd(T& a, T b, T mod) { a = (a + b + mod) % mod; }
template< typename T > void modMul(T& a, T b, T mod) { a = (a * b) % mod; }
template< typename T > void minUpdate(T& a, T b) { a = min(a, b); }
template< typename T > void maxUpdate(T& a, T b) { a = max(a, b); }

int bitCount(int x) { return __builtin_popcount(x); }
int bitCount(lint x) { return __builtin_popcountll(x); }

const int dx[4] = {0,1,0,-1}, dy[4] = {-1,0,1,0};
const int Dx[8] = {0,1,1,1,0,-1,-1,-1}, Dy[8] = {-1,-1,0,1,1,1,0,-1};
const double EPS = 1e-9;
const double PI = acos(-1);

//--------------8---------------->> coding space <<-----------------8-------------//

int N, a[100005];

int main() {
	cin >> N;
	for_(i,0,N) cin >> a[i];
	
	int xor_sum = 0;
	for_(i,0,N) xor_sum ^= a[i];
	
	int ans = 0;
	for_rev(b,30,1) {
		if (xor_sum >> b & 1) {
			int k = -1;
			for_(i,0,N) {
				if (a[i] == (1 << b)) {
					k = i;
					break;
				}
			}
			
			if (k == -1) {
				puts("-1");
				return 0;
			}
			
			xor_sum ^= a[k];
			a[k]--;
			xor_sum ^= a[k];
			++ans;
		}
	}
	
	if (xor_sum == 1) {
		bool flag = false;
		for_(i,0,N) flag |= (a[i] & 1);
		if (flag) {
			++ans;
		} else {
			puts("-1");
			return 0;
		}
	}
	
	cout << ans << endl;
}
//--------------8---------------->> coding space <<-----------------8-------------//

Submission Info

Submission Time
Task C - Cheating Nim
User tsukasa_diary
Language C++14 (GCC 5.4.1)
Score 0
Code Size 2026 Byte
Status WA
Exec Time 43 ms
Memory 640 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 0 / 500
Status
AC × 2
AC × 13
WA × 13
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 WA 1 ms 256 KB
001.txt AC 1 ms 256 KB
002.txt AC 43 ms 640 KB
003.txt AC 14 ms 512 KB
004.txt AC 16 ms 384 KB
005.txt AC 13 ms 384 KB
006.txt WA 40 ms 640 KB
007.txt WA 40 ms 640 KB
008.txt WA 40 ms 640 KB
009.txt WA 40 ms 640 KB
010.txt WA 40 ms 640 KB
011.txt WA 40 ms 640 KB
012.txt WA 41 ms 640 KB
013.txt WA 40 ms 640 KB
014.txt WA 40 ms 640 KB
015.txt WA 40 ms 640 KB
016.txt AC 40 ms 640 KB
017.txt AC 40 ms 640 KB
018.txt WA 40 ms 640 KB
019.txt WA 40 ms 640 KB
020.txt AC 40 ms 640 KB
021.txt AC 5 ms 256 KB
022.txt AC 5 ms 256 KB
023.txt AC 40 ms 640 KB
example0.txt AC 1 ms 256 KB
example1.txt AC 1 ms 256 KB