Kortit

input/code.cpp: In function 'int main()':
input/code.cpp:50:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i=0; i < cards.size(); i++) {
                 ~~^~~~~~~~~~~~~~

#include <stdio.h> // include before iostream for faster scanf
#include <iostream>
#include <vector>
#include <string>
#include <map>
#include <unordered_map>
#include <algorithm>
#include <utility>
#include <set>
#include <unordered_set>
#include <cmath>
#include <math.h>
#include <queue>
#include <stdlib.h>
#include <string.h>
#include <sstream>
#include <tuple>
#include <utility>
#include <iomanip>
#include <iterator>
 
using namespace std;
typedef long long LL;
 
#define printv(printVec) for (auto printVecIter : (printVec)) cout << printVecIter << " "; cout << endl;
 
// g++ -Wall -Wshadow -std=c++11 a.cpp && ./a.out
 
 
int main() {
	std::ios::sync_with_stdio(false);cin.tie(0);
	int t;cin>>t;
	while(t--) {
		int n;cin>>n;
		vector<int> cards(n/2);
		set<int> cees;
		for (int i =0;i<n/2;i++) {
			cin>>cards[i];
			cees.emplace(cards[i]);
		}
		sort(cards.begin(), cards.end());
		vector<int> ene;
		for (int c = 1; c <=n; c++) {
			if (!cees.count(c)) {
				ene.push_back(c);
			}
		}
		vector<bool> seen(ene.size());
		int ans = 0;
		for (int i=0; i < cards.size(); i++) {
			int j = ene.size() - 1;
			while ((j>=0 && ene[j] >= cards[i]) || seen[j]) {
				j--;
				if (j == -1) break;
			}
			if (j >= 0) {
				ans++;
				seen[j] = true;
			}
		}
		cout << ans << endl;
	}
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED