oj.uz

Submission #691020

# Submission time Handle Problem Language Result Execution time Memory
691020 2023-01-30T21:10:33 Z Ahmed_Solyman XOR Sum (info1cup17_xorsum) C++14
18 / 100
 1600 ms 58440 KB 
#include <bits/stdc++.h>
#include <ext/rope>
 
using namespace std;
using namespace __gnu_cxx;
#pragma GCC optimize("-Ofast")
#pragma GCC optimize("-O1")
//-------------------------------------------------------------//
typedef long long ll;
typedef unsigned long long ull;
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define PI acos(-1)
#define lb lower_bound
#define ub upper_bound
#define endl '\n'
#define all(v) v.begin(),v.end()
#define allr(v) v.rbegin(),v.rend()
#define sum_to(n) (n*(n+1))/2
#define pb push_back
#define pf push_front
#define sz size()
#define fil(arr,x) memset(arr,x,sizeof(arr))
const ll mod=1e9+7;
int dx[8]={0,1,0,-1,1,1,-1,-1};
int dy[8]={1,0,-1,0,1,-1,-1,1};
//-------------------------------------------------------------//
ll lcm(ll a,ll b)
{
    return (max(a,b)/__gcd(a,b))*min(a,b);
}
void person_bool(bool x)
{
    cout<<(x?"YES":"NO")<<endl;
}
int main()
{
    //freopen("input.txt","r",stdin);
    //freopen("output.txt","w",stdout);
    fast
    int n;cin>>n;
    vector<int>arr(n);
    for(auto &i:arr)cin>>i;
    int ans=0;
    map<int,int>fr;
    for(int i=0;i<n;i++){
    	++fr[arr[i]];
    }
    vector<int>v;
    set<int>s;
    map<int,int>vis;
    for(int i=0;i<n;i++){
    	if(fr[arr[i]]&1)s.insert(arr[i]);
    	if(vis[arr[i]])continue;
    	vis[arr[i]]=1;
    	ll k=(fr[arr[i]]*(fr[arr[i]]+1))/2;
    	if(k&1)ans^=(arr[i]*2);
    }
    for(auto i:s)v.pb(i);
    for(int i=0;i<v.sz;i++){
    	for(int j=i+1;j<v.sz;j++){
    		ans^=(v[i]+v[j]);
    	}
    }
    cout<<ans<<endl;
    return 0;
}

Compilation message

xorsum.cpp: In function 'int main()':
xorsum.cpp:59:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |     for(int i=0;i<v.sz;i++){
      |                  ^
xorsum.cpp:60:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |      for(int j=i+1;j<v.sz;j++){
      |                     ^

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 852 KB Output is correct
2 Correct 7 ms 852 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 376 ms 4696 KB Output is correct
2 Correct 348 ms 4400 KB Output is correct

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 376 ms 4696 KB Output is correct
2 Correct 348 ms 4400 KB Output is correct
3 Execution timed out 1670 ms 58440 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #4
0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 852 KB Output is correct
2 Correct 7 ms 852 KB Output is correct
3 Execution timed out 1686 ms 15400 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 852 KB Output is correct
2 Correct 7 ms 852 KB Output is correct
3 Correct 376 ms 4696 KB Output is correct
4 Correct 348 ms 4400 KB Output is correct
5 Execution timed out 1670 ms 58440 KB Time limit exceeded
6 Halted 0 ms 0 KB -