Submission #487852

#	Time	Username	Problem	Language	Result	Execution time	Memory
487852		inksamurai	Bajka (COCI20_bajka)	C++17	70 / 70	28 ms	320 KiB

bajka

#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(),a.end()
#define rep(i,n) for(int i=0;i<n;i++)
#define crep(i,x,n) for(int i=x;i<n;i++)
#define drep(i,n) for(int i=n-1;i>=0;i--)
#define vec(...) vector<__VA_ARGS__>
#define _3HaBFkZ ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0)
using namespace std;
typedef long long ll;
typedef long double ld;
using pii=pair<int,int>;
using vi=vector<int>;

int main(){
_3HaBFkZ;
	int n,m;
	cin>>n>>m;
	string s,t;
	cin>>s>>t;
	vi dp(n,1e9),nedp;
	rep(i,n){
		if(s[i]==t[0]) dp[i]=0;
	}
	crep(j,1,m){
		nedp=vi(n,1e9);
		char need=t[j];
		auto affine=[&](int i,int val){
			if(i>=0 and i<n and s[i]==need){
				nedp[i]=min(nedp[i],val);
			}
		};
		rep(i,n){
			if(dp[i]==1e9) continue;
			affine(i-1,dp[i]+1);
			affine(i+1,dp[i]+1);
			rep(nei,n){
				if(s[nei]!=s[i]) continue;
				if(nei-1>=0 or nei+1<n){
					affine(nei-1,dp[i]+abs(i-nei)+1);
					affine(nei+1,dp[i]+abs(i-nei)+1);
				}
			}
		}
		swap(dp,nedp);
	}
	int ans=*min_element(all(dp));
	if(ans>=1e9) cout<<"-1\n";
	else cout<<ans<<"\n";
//	
	return 0;
}

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