Submission #166869

#	Time	Username	Problem	Language	Result	Execution time	Memory
166869		Eae02	Genetics (BOI18_genetics)	C++14	19 / 100	2087 ms	2680 KiB

genetics

#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
using namespace std;

bitset<4101> dna[4101];

int diff[4101][4101];

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	
	int n, m, k;
	cin >> n >> m >> k;
	
	vector<int> permN(n);
	iota(permN.begin(), permN.end(), 0);
	random_shuffle(permN.begin(), permN.end());
	
	vector<int> permM(m);
	iota(permM.begin(), permM.end(), 0);
	random_shuffle(permM.begin(), permM.end());
	
	for (int i = 0; i < n; i++) {
		string ln; cin >> ln;
		for (int j = 0; j < m; j++) {
			if (ln[j] == 'A')
				dna[permN[i]].set(permM[j]);
		}
	}
	
	vector<int> cand;
	cand.reserve(n);
	for (int a = 1; a < n; a++) {
		if ((dna[a] ^ dna[0]).count() == k) {
			cand.push_back(a);
		}
	}
	
	int ans = 0;
	if (cand.size() < n - 1) {
		for (int a : cand) {
			bool ok = true;
			for (int b = 1; b < n; b++) {
				if (a != b && (dna[a] ^ dna[b]).count() != k) {
					ok = false;
					break;
				}
			}
			if (ok) {
				ans = a;
				break;
			}
		}
	}
	
	cout << (find(permN.begin(), permN.end(), ans) - permN.begin() + 1) << "\n";
}

Compilation message (stderr)

genetics.cpp: In function 'int main()':
genetics.cpp:35:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if ((dna[a] ^ dna[0]).count() == k) {
       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
genetics.cpp:41:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if (cand.size() < n - 1) {
      ~~~~~~~~~~~~^~~~~~~
genetics.cpp:45:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if (a != b && (dna[a] ^ dna[b]).count() != k) {
                   ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~

• Subtask 1: 0 / 27
• Subtask 2: 19 / 19
• Subtask 3: 0 / 28
• Subtask 4: 0 / 26