Submission #366411

#	Time	Username	Problem	Language	Result	Execution time	Memory
366411		Vimmer	Bajka (COCI20_bajka)	C++14	70 / 70	39 ms	760 KiB

bajka

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

//#pragma GCC optimize("-O3")
//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-Ofast")

#define N 100500
#define NN 205000
#define PB push_back
#define endl '\n'
#define pri(x) cout << x << endl
#define _ << " " <<
#define all(x) x.begin(), x.end()
#define sz(x) int(x.size())
#define M ll(1e9 + 7)
#define F first
#define S second

using namespace std;
//using namespace __gnu_pbds;

typedef long long ll;
typedef long double ld;
typedef short int si;
typedef unsigned long long ull;

//typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

vector <int> vr[30];

int n, m, f[305][305];

string s, t;

int main()
{
    ios_base::sync_with_stdio(0); istream::sync_with_stdio(0); cin.tie(0); cout.tie(0);

//    freopen("1.in", "r", stdin);

    cin >> n >> m;

    cin >> s >> t;

    for (int i = 0; i < sz(s); i++)
        vr[s[i] - 'a'].PB(i);

    int ans = -1;

    for (int i = 0; i < 305; i++)
        for (int j = 0; j < 305; j++)
          f[i][j] = 1e9;

    for (int i = 0; i < n; i++)
        if (s[i] == t[0])
          f[i][0] = 0;

    for (int j = 1; j < m; j++)
      for (int i = 0; i < n; i++)
      {
          if (f[i][j - 1] == 1e9) continue;

          for (auto it : vr[s[i] - 'a'])
          {
               int dst = abs(it - i) + 1 + f[i][j - 1];

               if (it != 0 && s[it - 1] == t[j])
                 f[it - 1][j] = min(f[it - 1][j], dst);

               if (it + 1 != n && s[it + 1] == t[j])
                 f[it + 1][j] = min(f[it + 1][j], dst);
          }
      }

    for (int i = 0; i < n; i++)
        if (f[i][m - 1] != 1e9 && (ans == -1 || ans > f[i][m - 1]))
        {
            ans = f[i][m - 1];
        }

    pri(ans);
}

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