Submission #607562

#	Time	Username	Problem	Language	Result	Execution time	Memory
607562		jairRS	Mutating DNA (IOI21_dna)	C++17	21 / 100	1588 ms	4804 KiB

dna

#include "dna.h"
#include <bits/stdc++.h>
using namespace std;
using vi = vector<int>;

string ga, gb;
map<char, vi> prefixCharA;
map<char, vi> prefixCharB;
char characters[3] = {'A', 'T', 'C'};

void init(string a, string b)
{
	int n = a.size();
	ga = ' ' + a;
	gb = ' ' + b;
	for (char c : characters)
	{
		prefixCharA[c] = prefixCharB[c] = vi(n + 1, 0);
		for (int i = 1; i <= n; i++)
		{
			prefixCharA[c][i] = (ga[i] == c) + prefixCharA[c][i - 1];
			prefixCharB[c][i] = (gb[i] == c) + prefixCharB[c][i - 1];
		}
	}
}

int swapDistance(string &a, string b)
{
	if (a == b)
		return 0;

	int res = 1e9 + 1;
	for (int i = 0; i < b.size(); i++)
		for (int j = i + 1; j < b.size(); j++)
		{
			if (b[i] == b[j] || a[i] == b[i] || a[j] == b[j])
				continue;
			swap(b[i], b[j]);
			res = min(res, swapDistance(a, b) + 1);
			swap(b[i], b[j]);
		}
	return res;
}

int get_distance(int x, int y)
{
	x++, y++;

	bool pos = true;
	for (char c : characters)
	{
		int countInA = prefixCharA[c][y] - prefixCharA[c][x - 1];
		int countInB = prefixCharB[c][y] - prefixCharB[c][x - 1];
		pos &= (countInA == countInB);
	}

	if (!pos)
		return -1;

	string s1 = string(ga.begin() + x, ga.begin() + y + 1);
	string s2 = string(gb.begin() + x, gb.begin() + y + 1);
	return swapDistance(s1, s2);
}

Compilation message (stderr)

dna.cpp: In function 'int swapDistance(std::string&, std::string)':
dna.cpp:33:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |  for (int i = 0; i < b.size(); i++)
      |                  ~~^~~~~~~~~~
dna.cpp:34:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |   for (int j = i + 1; j < b.size(); j++)
      |                       ~~^~~~~~~~~~

• Subtask 1: 21 / 21
• Subtask 2: 0 / 22
• Subtask 3: 0 / 13
• Subtask 4: 0 / 28
• Subtask 5: 0 / 16