#include<bits/stdc++.h>
#pragma GCC optimization("g", on)
#pragma GCC optimize ("inline")
#pragma GCC optimization("03")
#pragma GCC optimization("unroll-loops")
//#pragma comment(linker, "/stack:200000000")
//#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popused,abm,mmx,avx,tune=native")
using namespace std;
const int N = 1e6 + 5;
const long long inf = 1000000000;
#define ll long long
#define F first
#define S second
#define pb push_back
int n, x[N];
//map<int, bool> used;
//map<int, int> cnt;
//vector<int> v;
long long res;
main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin >> n;
for(int i = 1; i <= n; ++i){
cin >> x[i];
}
for(int i = 1; i <= n; ++i){
for(int j = i; j <= n; ++j){
res ^= x[i] + x[j];
}
}
cout << res;
}
Compilation message
xorsum.cpp:3: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
3 | #pragma GCC optimization("g", on)
|
xorsum.cpp:5: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
5 | #pragma GCC optimization("03")
|
xorsum.cpp:6: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
6 | #pragma GCC optimization("unroll-loops")
|
cc1plus: error: attribute 'popused' argument 'target' is unknown
xorsum.cpp:26:2: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
26 | main() {
| ^~~~
