Submission #851406

#	Time	Username	Problem	Language	Result	Execution time	Memory
851406		vjudge1	Bajka (COCI20_bajka)	C++17	70 / 70	74 ms	860 KiB

bajka

//author:
#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
#define ONLINE_JUDGE
const int INF = 1e9 + 7;

const int MAXN = 300 + 5;

int dp[MAXN][MAXN];

void solve() {
    memset(dp, -1, sizeof(dp));

    int n, m; 
    cin >> n >> m;

    string a, b;
    cin >> a >> b;

    a = '$' + a;
    a = a + '$';
    b = '$' + b;
    b = b + '$';

    function <int(int, int)> f = [&](int x, int al) -> int {
        if(dp[x][al] != -1)
            return dp[x][al];
        
        if(al == m +1) 
            return 0;

        int res = INF;
        for(int i = 1; i <= n; i++) {
            if(a[i] == b[al]) {
                if(abs(i - x) == 1) {
                    res = min(res, f(i, al +1) + abs(i - x));
                } 
                if(a[i +1] == a[x] && abs((i +1) - x) != 0) {
                    res = min(res, f(i, al +1) + abs((i +1) - x) + abs((i +1) - i));
                }
                if(a[i -1] == a[x] && abs((i -1) - x) != 0) {
                    res = min(res, f(i, al +1) + abs((i -1) - x) + abs((i -1) - i));
                }
            }
        }

        return dp[x][al] = res;
    };

    int ans = INF;
    for(int i = 1; i <= n; i++) {
        if(a[i] == b[1]) {
            ans = min(ans, f(i, 2));
        }
    }

    cout << (ans == INF ? -1 : ans);
    
    return;
}

signed main() {
    #ifndef ONLINE_JUDGE
        freopen(".in", "r", stdin);
        freopen(".out", "w", stdout);
    #endif

    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);

    int t = 1; //cin >> t;
    while(t--)
        solve();

    return 0;
}

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