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Submission #413469

# Submission time Handle Problem Language Result Execution time Memory
413469 2021-05-28T18:51:12 Z KKT89 XOR Sum (info1cup17_xorsum) C++17
77 / 100
 1600 ms 13572 KB 
#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef unsigned long long ull;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myRand(ll B) {
    return (ull)rng() % B;
}

int main(){
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	int n; cin >> n;
	vector<int> a(n);
	for(int i=0;i<n;i++){
		cin >> a[i];
	}
	int res=0;
	for(int v=(1<<28);v;v>>=1){
		for(int i=0;i<n;i++){
			a[i]&=(v*2-1);
		}
		sort(a.begin(), a.end());
		int t=0;
		for(int i=n-1,j=0,k=0,l=0;i>=0;i--){
			j=min(j,i); k=min(k,i); l=min(l,i);
			while(j<i+1 and a[i]+a[j]<v)j++;
			while(k<i+1 and a[i]+a[k]<2*v)k++;
			while(l<i+1 and a[i]+a[l]<3*v)l++;
			t+=(k-j)+(n-l);
			t&=1;
		}
		if(t)res^=v;
	}
	cout << res << endl;
}

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 332 KB Output is correct
2 Correct 7 ms 376 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1006 ms 4224 KB Output is correct
2 Correct 904 ms 8264 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1006 ms 4224 KB Output is correct
2 Correct 904 ms 8264 KB Output is correct
3 Correct 1405 ms 10968 KB Output is correct
4 Correct 1382 ms 10584 KB Output is correct

Subtask #4
38.0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 332 KB Output is correct
2 Correct 7 ms 376 KB Output is correct
3 Correct 217 ms 1644 KB Output is correct
4 Correct 184 ms 1644 KB Output is correct

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 332 KB Output is correct
2 Correct 7 ms 376 KB Output is correct
3 Correct 1006 ms 4224 KB Output is correct
4 Correct 904 ms 8264 KB Output is correct
5 Correct 1405 ms 10968 KB Output is correct
6 Correct 1382 ms 10584 KB Output is correct
7 Correct 217 ms 1644 KB Output is correct
8 Correct 184 ms 1644 KB Output is correct
9 Execution timed out 1629 ms 13572 KB Time limit exceeded
10 Halted 0 ms 0 KB -