Submission #804775

#	Time	Username	Problem	Language	Result	Execution time	Memory
804775		tlnk07	Bajka (COCI20_bajka)	C++17	70 / 70	26 ms	980 KiB

bajka

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

long long n, m, mini = INT_MAX, val[301][301];
string s, str;
vector<int> vec[30];

long long backtrack(int pos, int x)
{
	if(val[pos][x])	return val[pos][x];
	if(x == m)	return 0;
	long long temp = INT_MAX;
	for(int i : vec[s[pos] - 'a'])
	{
		if(i < n - 1 && s[i + 1] == str[x])	temp = min(temp, backtrack(i + 1, x + 1) + abs(pos - i) + 1);
		if(i > 0 && s[i - 1] == str[x])	temp = min(temp, backtrack(i - 1, x + 1) + abs(pos - i) + 1);
	}
	val[pos][x] = temp;
	return temp;
}

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);	cout.tie(NULL);
	cin >> n >> m >> s >> str;
	for(int i = 0; i < n; ++i)	vec[s[i] - 'a'].push_back(i);
	for(int c : vec[str[0] - 'a'])	mini = min(mini, backtrack(c, 1));
	if(mini < INT_MAX)	cout << mini;
	else	cout << -1;
}

• Subtask 1: 20 / 20
• Subtask 2: 50 / 50