Submission #975205

#	Time	Username	Problem	Language	Result	Execution time	Memory
975205		ziewacz	XOR Sum (info1cup17_xorsum)	C++17	7 / 100	106 ms	131072 KiB

xorsum

#include <bits/stdc++.h>
#define debug(x...) cerr << "[" #x "]: ", [](auto... $) {((cerr << $ << "; "), ...); }(x), cerr << '\n'
using namespace std;
typedef long long ll;
typedef long double ld;
constexpr int MOD = 1000000007;


int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0);
    
    int n;
    cin >> n;
    vector<int> a(n);
    for(int i = 0; i < n; i++) {
        cin >> a[i];
    }
    vector<int> sumy;
    for(int i = 0; i < n; i++) {
        for(int j = i; j < n; j++) {
            sumy.push_back(a[i] + a[j]);
        }
    }
    int ans = sumy[0];
    for(int i = 1; i < sumy.size(); i++) {
        ans ^= sumy[i];
    }
    cout << ans;
    return 0;
}

Compilation message (stderr)

xorsum.cpp: In function 'int main()':
xorsum.cpp:26:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |     for(int i = 1; i < sumy.size(); i++) {
      |                    ~~^~~~~~~~~~~~~

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