Submission #920817

#	Time	Username	Problem	Language	Result	Execution time	Memory
920817		blackavar	Bajka (COCI20_bajka)	C++14	50 / 70	1 ms	348 KiB

bajka

#include <iostream>
#include <vector>
using namespace std;
const int N = 2e3 + 10;
int dp[2][N];
vector<int> pos[26];
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    long long n, m;
    cin >> n >> m;
    string s, t;
    cin >> s >> t;
    for(int i = 0; i < n; ++i) {
        pos[s[i] - 'a'].push_back(i);
    }
/*
7 7
monolog
nogolom
*/
    bool st = 0;
    for(int i = 0; i < n; ++i) dp[st][i] = 1e9;
    for(auto &p : pos[t[0] - 'a']) dp[st][p] = 0;
    int ans = 1e9, f = 0;
    //for(auto &p : pos['o' - 'a']) cout << p << " ";
    //return 0;
    for(int i = 1; i < m; ++i) {
        if(f) continue;
        if(pos[t[i] - 'a'].empty()) {
            f = 1;
            continue;
        }
        st ^= 1;
        for(int j = 0; j < n; ++j) dp[st][j] = 1e9;
        //int cnt = 0;  
        for(auto &p1 : pos[t[i] - 'a']) {
            //++cnt;
            //if(i == 5) {
             //   cout << p1 << " ";
             //   if(cnt == 2) exit(0);
            //}
            //p1 = 3;
            if(p1 != 0 && s[p1 - 1] == t[i - 1]) dp[st][p1] = min(dp[st][p1], dp[st ^ 1][p1 - 1] + 1);
            if(p1 != n - 1 && s[p1 + 1] == t[i - 1]) dp[st][p1] = min(dp[st][p1], dp[st ^ 1][p1 + 1] + 1);
            if(i == m - 1) ans = min(ans, dp[st][p1]);
        }
        int l = pos[t[i] - 'a'][0], r = pos[t[i]- 'a'].back();
        int tmp = 1e9;
        for(int j = l; j <= r; ++j, ++tmp) {
            if(s[j] != t[i]) continue;
            tmp = dp[st][j] = min(tmp, dp[st][j]);
        }
        tmp = 1e9;
        for(int j = r; j >= l; --j, ++tmp) {
            if(s[j] != t[i]) continue;
            tmp = dp[st][j] =  min(tmp, dp[st][j]);
        }
    }
    cout << (ans >= 1e9 ? -1 : ans);
    return 0;
}
 

• Subtask 1: 0 / 20
• Subtask 2: 50 / 50