oj.uz

Submission #496787

# Submission time Handle Problem Language Result Execution time Memory
496787 2021-12-22T04:32:17 Z ergagan XOR Sum (info1cup17_xorsum) C++17
18 / 100
 1600 ms 8132 KB 
//я так много думал, что опять попал
#include <bits/stdc++.h>
#define all(x) x.begin(),x.end()
#define pb push_back
#define ppb pop_back
#define pf push_front
#define ppf pop_front
#define f first
#define s second
#define left(v) v + v
#define right(v) v + v + 1
#define ub upper_bound
#define lb lower_bound

using namespace std;
typedef long long ll;

//#pragma comment(linker, "/stack:200000000")
//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

//17 SEVENTEEN
const long double Pi = acos(-1.0);
const ll dx[] = {0,0,1,-1};
const ll dy[] = {1,-1,0,0};
const ll N = (ll) 1e6 + 17;
const ll M = (ll) 5e3 + 69;
const ll inf = (ll) 1e14 + 3;
const ll mod = (ll) 1e9 + 7;
ll sq(ll x) { return x * x; }

ll zxc = 1, a[N], cnt[N];

void solve() {
    ll n, xr = 0, mx = 0;
    cin >> n;
    for(ll i = 1; i <= n; i++) {
        cin >> a[i];
        mx = max(mx, a[i]);
    }
    if(mx > M) {

        for(ll i = 1; i <= n; i++) {
            for(ll j = i; j <= n; j++) {
                xr ^= (a[i] + a[j]);
            }
        }
        cout << xr;
        return;
    }
    if(mx <= M) {
        for(ll i = 1; i <= n; i++) {
            cnt[a[i]]++;
        }

        for(ll i = 1; i <= M; i++) {
            for(ll j = i; j <= M; j++) {
                if(cnt[i] && cnt[j]) {
                    if(i == j && (cnt[i] * (cnt[i] + 1) / 2) % 2) xr ^= (i + j);
                    if(cnt[i] * cnt[j] % 2 && i != j) xr ^= (i + j);
                }
            }
        }
        cout << xr;
        return;
    }

}

int main(/*Уверенно*/) {
ios_base::sync_with_stdio(0);
    cin.tie(0);
/*
	freopen(".in", "r", stdin);
	freopen(".out", "w", stdout);
*/
//    cin >> zxc;
    while(zxc--) {
        solve();
    }
  	return 0;
}
// さよならさ いかなくちゃ

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 332 KB Output is correct
2 Correct 5 ms 320 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 79 ms 8088 KB Output is correct
2 Correct 80 ms 7608 KB Output is correct

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 79 ms 8088 KB Output is correct
2 Correct 80 ms 7608 KB Output is correct
3 Execution timed out 1680 ms 8132 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #4
0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 332 KB Output is correct
2 Correct 5 ms 320 KB Output is correct
3 Execution timed out 1691 ms 1072 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 332 KB Output is correct
2 Correct 5 ms 320 KB Output is correct
3 Correct 79 ms 8088 KB Output is correct
4 Correct 80 ms 7608 KB Output is correct
5 Execution timed out 1680 ms 8132 KB Time limit exceeded
6 Halted 0 ms 0 KB -