Submission #551091

#	Time	Username	Problem	Language	Result	Execution time	Memory
551091		Olympia	XOR Sum (info1cup17_xorsum)	C++17	0 / 100	1689 ms	4308 KiB

xorsum

#include <iostream>
#include <vector>
#include <iomanip>
#include <algorithm>
#include <cassert>
#include <map>
#include <complex>
#include <cmath>
#include <set>
#include <queue>
using namespace std;

#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
int main () {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n;
    cin >> n;
    vector<int> v(n);
    for (int i = 0; i < n; i++) {
        cin >> v[i];
    }
    int x = 0;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < i; j++) {
            x ^= (v[i] + v[j]);
        }
    }
    cout << x << '\n';
}

Compilation message (stderr)

xorsum.cpp:14: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
   14 | #pragma GCC optimization ("O3")
      | 
xorsum.cpp:15: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
   15 | #pragma GCC optimization ("unroll-loops")
      |

• Subtask 1: 0 / 7
• Subtask 2: 0 / 11
• Subtask 3: 0 / 21
• Subtask 4: 0 / 38
• Subtask 5: 0 / 23