95A - Hockey - CodeForces Solution

#include<bits/stdc++.h>

using namespace std;


int main(){

    int n;
    cin>>n;
    
    vector<string> v;

    for(int i=0;i<n;i++){
        string s;
        cin>>s;
        v.push_back(s);
    }

    string w;
    cin>>w;

    char ch;
    cin>>ch;

    string res = w;
    string t = w;


    char x = 'a';

    if(ch==x){
        x = 'b';
    }

    transform(w.begin(),w.end() , w.begin(), :: toupper);

    for(int i=0;i<n;i++){

        string s = v[i];
        if(s.length()>w.length()){
            continue;
        }
        transform(s.begin(),s.end() , s.begin(), :: toupper);

        for(int i=0;i<=w.length()-s.length();i++){

            if(w.substr(i,s.length())==s){

                for(int j=i;j<i+s.length();j++){
                    if(isupper(t[j])){
                        if(t[j]==toupper(ch)){
                            res[j] = toupper(x);
                            continue;
                        }
                        res[j] = toupper(ch);
                    }
                    else{
                        if(t[j]==tolower(ch)){
                            res[j] = tolower(x);
                            continue;
                        }
                        res[j] = tolower(ch);
                    }
                }
            }
        }

    }

    cout<<res<<endl;


    return 0;
}