This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <iostream>
#include <bits/stdc++.h>
#include <cmath>
#include <algorithm>
#include <vector>
#include <deque>
#include <set>
#include <stack>
#include <string>
#include <map>
#include <queue>
#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")
using namespace std;
const long long oo = 1000000000000000000;
long long int sum, ans = 0, mx = 0, mn = 1000000000, num, pos;
/*
ViHHiPuh
(( `'-""``""-'` ))
)-__-_.._-__-(
/ --- (o _ o) --- \
\ .-* ( .0. ) *-. /
_'-. ,_ '=' _, .-'_
/ `;#'#'# - #'#'#;` \
\_)) -----'#'----- ((_/
# --------- #
'# ------- ------ #'
/..-'# ------- #'-.\
_\...-\'# -- #'/-.../_
((____)- '#' -(____))
cout << fixed << setprecision(6) << x;
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
freopen ( "sum.in", "r", stdin )
*/
int mp[ 10001 ];
map <int, int> mpp;
set <int> st, s;
vector <int> v;
int main () {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
int n;
cin >> n;
int a[ n + 1 ];
for ( int i = 1; i <= n; i ++ ) {
cin >> a[ i ];
mx = max( mx, a[ i ] + 0ll );
}
if ( mx >= 5000 ) {
for ( int i = 1; i <= n; i ++ ) {
for ( int j = i; j <= n; j ++ ) {
sum = a[ i ] + a[ j ];
ans = ans ^ ( sum );
}
}
}
else {
for ( int i = 1; i <= n; i ++ )
mp[ a[ i ] ] ++;
for ( int i = 1; i <= mx; i ++ ) {
sum = mp[ i ] * ( mp[ i ] + 1 ) / 2;
if ( sum % 2 )
ans = ans ^ ( i + i );
for ( int j = i + 1; j <= mx; j ++ ) {
sum = mp[ i ] * ( mp[ j ] );
if ( sum % 2 )
ans = ans ^ ( i + j );
}
}
}
cout << ans;
}
/*
4
3 9 6 6
6
3
10
20
1 2 3
4 5 6 = 19
6 5 2
1 4 3 = 15
5 2
*/
Compilation message (stderr)
xorsum.cpp:12: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
12 | #pragma GCC optimization("g", on)
|
xorsum.cpp:14: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
14 | #pragma GCC optimization("03")
|
xorsum.cpp:15: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
15 | #pragma GCC optimization("unroll-loops")
|
xorsum.cpp:16: warning: ignoring '#pragma comment ' [-Wunknown-pragmas]
16 | #pragma comment(linker, "/stack:200000000")
|
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