Submission #522012

#	Time	Username	Problem	Language	Result	Execution time	Memory
522012		maks007	XOR Sum (info1cup17_xorsum)	C++14	18 / 100	1694 ms	36452 KiB

xorsum

#include <bits/stdc++.h>
 
using namespace std;
 
int main(void) {
	int n;
	cin>> n;
	vector <int> a(n);
	map <int,int> idx;
	for(int i = 0; i < n; i ++ ) {
		cin >> a[i];
		idx[a[i]] ++;
	}
	int ans = 0;
	sort(a.begin(), a.end());
	a.erase(unique(a.begin(), a.end()), a.end());
	for(int i = 0; i < a.size(); i ++) {
		for(int j = 0; j < a.size(); j ++) {
			if(a[j] < a[i]) {
				if(idx[a[i]]%2 and idx[a[j]]%2) {
					ans ^= (a[i] + a[j]);
				}
			}else if(a[j] == a[i]){
				int col = idx[a[i]] * (idx[a[i]] + 1) / 2;
				if(col % 2 == 1) {
					ans ^= (a[i] + a[j]);
				}
			}
		}
	}
	cout << ans;
	return false;
}

Compilation message (stderr)

xorsum.cpp: In function 'int main()':
xorsum.cpp:17:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |  for(int i = 0; i < a.size(); i ++) {
      |                 ~~^~~~~~~~~~
xorsum.cpp:18:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |   for(int j = 0; j < a.size(); j ++) {
      |                  ~~^~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 11 / 11
• Subtask 3: 0 / 21
• Subtask 4: 0 / 38
• Subtask 5: 0 / 23