oj.uz

Submission #496723

# Submission time Handle Problem Language Result Execution time Memory
496723 2021-12-22T03:27:07 Z Ierus XOR Sum (info1cup17_xorsum) C++17
7 / 100
 239 ms 8080 KB 
#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize ("unroll-loops,Ofast,O3")
#pragma GCC target("avx,avx2,fma")
#define F first
#define S second
#define int long long
#define sz(x) (int)x.size()
#define pb push_back
#define eb emplace_back
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define NFS ios_base::sync_with_stdio(0) , cin.tie(0) , cout.tie(0) ;
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
const int E = (int)1e6+777;
const int N = (int)4e3;
int n, a[E];
void solve1(int res = 0){
	for(int i = 1; i <= n; ++i){
		for(int j = i; j <= n; ++j){
			res ^= (a[i] + a[j]);
		}
	}
	cout << res;
	exit(false);
}
void solve2(int res = 0){
	vector<int> cnt(N, 0);
	for(int i = 1; i <= n; ++i){
		++cnt[a[i]];
	}
	for(int i = 1; i <= N; ++i){
		for(int j = i; j <= N; ++j){
			int cur = min(cnt[i], cnt[j]);
			if(cur & 1) res ^= (i + j);
		}
	}
	cout << res;
	exit(false);
}
signed main(){
	cin >> n;
	for(int i = 1; i <= n; ++i){
		cin >> a[i];
	}
	if(n <= 4 * 1000){
		solve1();
	}
	solve2();
}

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 312 KB Output is correct
2 Correct 6 ms 332 KB Output is correct

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 239 ms 8080 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Incorrect 239 ms 8080 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 312 KB Output is correct
2 Correct 6 ms 332 KB Output is correct
3 Runtime error 41 ms 1948 KB Execution killed with signal 11
4 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 312 KB Output is correct
2 Correct 6 ms 332 KB Output is correct
3 Incorrect 239 ms 8080 KB Output isn't correct
4 Halted 0 ms 0 KB -