/*
We found Despacito 5 during contest (not clickbait)
*/
#include <iostream>
#include <cstdio>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <algorithm>
#include <cstring>
#include <cfloat>
#include <cmath>
#include <cassert>
#include <locale>
#include <string>
#include <bitset>
#include <functional>
#include <climits>
#include <iomanip>
using namespace std;
#define read(x) freopen(x,"r",stdin)
#define write(x) freopen(x,"w",stdout)
#define cl(a,b) memset(a,b,sizeof(a))
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define ll long long
#define ld long double
#define vec vector
#define vi vec<int>
#define heap priority_queue
#define res reserve
#define pb push_back
#define f(x,y,z) for(int x=(y); x<(z); x++)
#define fd(x,y,z) for(int x=(y); x>=(z); x--)
#define fit(x,y) for(auto x: y)
#define srt(x) sort(all(x))
#define rsrt(x) sort(rall(x))
#define make_unique(x) sort(all((x))); (x).resize(unique(all((x))) - (x).begin())
#define pii pair<int,ll>
#define ppi pair<pii,int>
#define pip pair<int,pii>
#define mp make_pair
#define f1 first
#define s2 second
#define cdbg(x) cerr<<#x<<" = "<<x<<",\t";
#define cdbl cerr<<"\n----------\n";
#define pow2(x) ((x)*(x))
#define edist(x1, y1, x2, y2) (sqrt((pow2(x1-x2)+pow2(y1-y2))))
#define mdist(x1, y1, x2, y2) (abs((x1)-(x2))+abs((y1)-(y2)))
#define y1 FullSensei
#define mid ((ss+se)>>1)
#define left (si<<1)
#define right ((si<<1)+1)
#define pi 3.141592653589793
#define popcount __builtin_popcount
#define spc ' '
#define endl '\n'
#define lb lower_bound
bool checkbit(int x,int y){return (x&(1<<y));}
int setbit(int x,int y){return (x^(1<<y));}
const int dirs[4][2]={{1,0},{0,1},{-1,0},{0,-1}};
const int mod=1e9+7;
const int p1=805306457;
const int p2=1610612741;
const int INF=1e9;
const int N=1e6;
const int V=4e3;
vi buff, v;
int n;
int main(){
scanf("%d",&n);
v.res(N+3);
buff.res(V+3);
f(i,1,n+1){
int temp;
scanf("%d",&temp);
//assert(n<=4e3 || temp<=V);
buff.pb(temp);
}
srt(buff);
ll factor=0;
int cnt=1;
for(int i=0; i<buff.size(); i++){
if(i+1<buff.size()){
if(buff[i]!=buff[i+1]){
if(cnt==1){
v.pb(buff[i]);
continue;
}
if(cnt%2==1){
v.pb(buff[i]);
}
ll temp=cnt;
temp=temp*(cnt-1)/2+cnt;
if(temp%2==1){
factor^=((ll) buff[i]*2);
}
cnt=1;
}
else{
cnt++;
}
}
else{
if(cnt==1){
v.pb(buff[i]);
continue;
}
if(cnt%2==1){
v.pb(buff[i]);
}
ll temp=cnt;
temp=temp*(cnt-1)/2+cnt;
if(temp%2==1){
factor^=((ll) buff[i]*2);
}
cnt=1;
}
}
ll ans=factor;
f(i,0,v.size()){
f(j,i,v.size()){
ll temp = (ll) v[i] + v[j];
// cerr<<v[i]<<spc<<v[j]<<spc<<temp<<spc<<ans<<endl;
ans ^= temp;
}
}
cout<<ans<<endl;
return 0;
}
Compilation message
xorsum.cpp: In function 'int main()':
xorsum.cpp:87:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0; i<buff.size(); i++){
~^~~~~~~~~~~~
xorsum.cpp:88:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if(i+1<buff.size()){
~~~^~~~~~~~~~~~
xorsum.cpp:36:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
#define f(x,y,z) for(int x=(y); x<(z); x++)
^
xorsum.cpp:125:2: note: in expansion of macro 'f'
f(i,0,v.size()){
^
xorsum.cpp:36:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
#define f(x,y,z) for(int x=(y); x<(z); x++)
^
xorsum.cpp:126:3: note: in expansion of macro 'f'
f(j,i,v.size()){
^
xorsum.cpp:75:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&n);
~~~~~^~~~~~~~~
xorsum.cpp:80:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&temp);
~~~~~^~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
14 ms |
380 KB |
Output is correct |
| 2 |
Correct |
9 ms |
488 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
271 ms |
4624 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
271 ms |
4624 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
14 ms |
380 KB |
Output is correct |
| 2 |
Correct |
9 ms |
488 KB |
Output is correct |
| 3 |
Execution timed out |
1645 ms |
4624 KB |
Time limit exceeded |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
14 ms |
380 KB |
Output is correct |
| 2 |
Correct |
9 ms |
488 KB |
Output is correct |
| 3 |
Incorrect |
271 ms |
4624 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
