Submission #705783

#	Time	Username	Problem	Language	Result	Execution time	Memory
705783		Abito	Bajka (COCI20_bajka)	C++17	70 / 70	61 ms	1236 KiB

bajka

#include <bits/stdc++.h>
#define F first
#define S second
#define pb push_back
#define ppb pop_back
#define ep insert
#define endl '\n'
#define elif else if
#define pow pwr
#define sqrt sqrtt
#define int long long
typedef unsigned long long ull;
using namespace std;
const int N=305;
int dp[N][N],n,m;
char a[N],b[N];
bool vis[N][N];
vector<int> adj[30];
set<char> s;
int rec(int i,int j){
    //cout<<i<<' '<<j<<endl;
    if (j==m) return 0;
    if (vis[i][j]) return dp[i][j];
    vis[i][j]=true;
    dp[i][j]=INT_MAX;
    if (i>1){
        if (a[i-1]==b[j+1]) dp[i][j]=min(dp[i][j],rec(i-1,j+1)+1);
    }
    if (i<n){
        if (a[i+1]==b[j+1]) dp[i][j]=min(dp[i][j],rec(i+1,j+1)+1);
    }
    for (auto u:adj[a[i]-'a']) dp[i][j]=min(dp[i][j],rec(u,j)+abs(u-i));
    return dp[i][j];
}
int32_t main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    cin>>n>>m;
    for (int i=1;i<=n;i++){
        cin>>a[i];
        s.ep(a[i]);
        adj[a[i]-'a'].pb(i);
    }
    for (int j=1;j<=m;j++) cin>>b[j];
    if (s.size()==n){
    int idx=0;
    for(int i=1;i<=n;i++){
        if(a[i]==b[1]) idx=i;
    }
    if(idx==0){
        cout<<-1;
        return 0;
    }
    int ans=0;
    for(int i=2;i<=m;i++){
         bool c=0;
         if(idx+1<=m && a[idx+1]==b[i]){
            ans++;
            c=1;
            idx++;
         }
         else if(idx-1>=1 && a[idx-1]==b[i]){
            ans++;
            c=1;
            idx--;
         }
         if(!c){
            cout<<-1;
            return 0;
         }
    }
    cout<<ans;
    return 0;
    }
    int ans=INT_MAX;
    for (int i=1;i<=n;i++) ans=min(ans,rec(i,0));
    if (ans>=INT_MAX) cout<<-1<<endl;
    else cout<<ans-1<<endl;
    return 0;
}

Compilation message (stderr)

bajka.cpp: In function 'int32_t main()':
bajka.cpp:44:17: warning: comparison of integer expressions of different signedness: 'std::set<char>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   44 |     if (s.size()==n){
      |         ~~~~~~~~^~~

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