Submission #954152

#	Time	Username	Problem	Language	Result	Execution time	Memory
954152		Alan	Genetics (BOI18_genetics)	C++17	0 / 100	10 ms	8616 KiB

genetics

#include <bits/stdc++.h>
using namespace std;

string s[4105], t[4105];
map<string, int> mp;
bool bad[4105];

int diff (int x, int y) {
	int cnt = 0;
	for (int i = 0; i < (int) s[x].size(); i++) cnt += s[x][i] != s[y][i];
	return cnt;
}

int main () {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n, m, k, ptr = 0;
	cin >> n >> m >> k;
	for (int i = 1; i <= n; i++) {
		cin >> s[i];
		mp[s[i]]++;
	}
	for (int i = 1; i <= n; i++) if (mp[s[i]] > 1) bad[i] = true;
	deque<int> dq;
	for (int i = 1; i <= n; i++) if (!bad[i]) {
		while (i <= n && !dq.empty() && diff(dq.back(), i) != k) {
			i++;
			dq.pop_back();
		}
		if (i > n) break;
		dq.push_back(i);
	}
	while ((int) dq.size() > 2) {
		assert(diff(dq.front(), dq.back()) == k);
		dq.pop_front();
		dq.pop_back();
	}
	if ((int) dq.size() > 1) {
		for (int i = 1; i <= n; i++) if (i != dq[0] && diff(i, dq[0]) != k) {
			dq.pop_front();
			break;
		}
		if ((int) dq.size() > 1) dq.pop_back();
	}
	cout << dq[0] << '\n';
	return 0;
}

Compilation message (stderr)

genetics.cpp: In function 'int main()':
genetics.cpp:17:15: warning: unused variable 'ptr' [-Wunused-variable]
   17 |  int n, m, k, ptr = 0;
      |               ^~~

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