Submission #359928

#	Time	Username	Problem	Language	Result	Execution time	Memory
359928		MrRobot_28	Bajka (COCI20_bajka)	C++17	70 / 70	2 ms	748 KiB

bajka

#include<bits/stdc++.h>
using namespace std;
signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n, m;
    cin >>n >> m;
    string s, t;
    cin >> s >> t;
    vector <int> pos[26];
    for(int i = 0; i < n; i++)
    {
        pos[s[i] - 'a'].push_back(i);
    }
    vector <vector <int> > dp(m, vector <int> (n, 1e9));
    for(int i = 0; i < pos[t[0] - 'a'].size(); i++)
    {
        int ind = pos[t[0] - 'a'][i];
        dp[0][ind] = 1;
    }
    for(int it = 1; it < m; it++)
    {
        int i1 = t[it - 1] - 'a';
        int minval = 1e9;
        int en = -1;
        for(int i = 0; i < pos[i1].size(); i++)
        {
            int ind = pos[i1][i];
            minval += ind - en;
            minval = min(minval, dp[it - 1][ind]);
            if(ind > 0 && s[ind - 1] == t[it])
            {
                dp[it][ind - 1] = min(dp[it][ind - 1], minval + 1);
            }
            if(ind < n - 1 && s[ind + 1] == t[it])
            {
                dp[it][ind + 1] = min(dp[it][ind + 1], minval + 1);
            }
            en = ind;
        }
        minval = 1e9;
        en = 1e9;
        for(int i = pos[i1].size() - 1;i >= 0; i--)
        {
            int ind = pos[i1][i];
            minval += en - ind;
            minval = min(minval, dp[it - 1][ind]);
            if(ind > 0 && s[ind - 1] == t[it])
            {
                dp[it][ind - 1] = min(dp[it][ind - 1], minval + 1);
            }
            if(ind < n - 1 && s[ind + 1] == t[it])
            {
                dp[it][ind + 1] =  min(dp[it][ind + 1], minval + 1);
            }
            en = ind;
        }
    }
    int ans = 1e9;
    for(int i = 0; i < n; i++)
    {
        ans = min(ans, dp[m - 1][i] - 1);
    }
    if(ans == 1e9 - 1)
    {
        ans = -1;
    }
    cout << ans;
    return 0;
}

Compilation message (stderr)

bajka.cpp: In function 'int main()':
bajka.cpp:18:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |     for(int i = 0; i < pos[t[0] - 'a'].size(); i++)
      |                    ~~^~~~~~~~~~~~~~~~~~~~~~~~
bajka.cpp:28:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |         for(int i = 0; i < pos[i1].size(); i++)
      |                        ~~^~~~~~~~~~~~~~~~

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