Ransom Note.cpp

/* Hacker Rank */
/* Title - Ransom Note */
/* Created By - Akash Modak */
/* Date - 23/8/2020 */

// Harold is a kidnapper who wrote a ransom note, but now he is worried it will be traced back to him through his handwriting. He found a magazine and wants to know if he can cut out whole words from it and use them to create an untraceable replica of his ransom note. The words in his note are case-sensitive and he must use only whole words available in the magazine. He cannot use substrings or concatenation to create the words he needs.

// Given the words in the magazine and the words in the ransom note, print Yes if he can replicate his ransom note exactly using whole words from the magazine; otherwise, print No.

// For example, the note is "Attack at dawn". The magazine contains only "attack at dawn". The magazine has all the right words, but there's a case mismatch. The answer is No.

#include <bits/stdc++.h>

using namespace std;

vector<string> split_string(string);

// Complete the checkMagazine function below.
void checkMagazine(vector<string> magazine, vector<string> note) {
    unordered_map<string,int> mag,no;
    if(magazine.size()<note.size())
    cout<<"No"<<endl;
    else{
        for(auto x:magazine)
        mag[x]++;

        for(auto x:note)
        no[x]++;
        bool flag = true;
        for(auto x : no){
            if(x.second>mag[x.first]){
                flag = false;
                break;
            }
        }
        if(flag)
        cout<<"Yes"<<endl;
        else
        cout<<"No"<<endl;
    }

}

int main()
{
    string mn_temp;
    getline(cin, mn_temp);

    vector<string> mn = split_string(mn_temp);

    int m = stoi(mn[0]);

    int n = stoi(mn[1]);

    string magazine_temp_temp;
    getline(cin, magazine_temp_temp);

    vector<string> magazine_temp = split_string(magazine_temp_temp);

    vector<string> magazine(m);

    for (int i = 0; i < m; i++) {
        string magazine_item = magazine_temp[i];

        magazine[i] = magazine_item;
    }

    string note_temp_temp;
    getline(cin, note_temp_temp);

    vector<string> note_temp = split_string(note_temp_temp);

    vector<string> note(n);

    for (int i = 0; i < n; i++) {
        string note_item = note_temp[i];

        note[i] = note_item;
    }

    checkMagazine(magazine, note);

    return 0;
}

vector<string> split_string(string input_string) {
    string::iterator new_end = unique(input_string.begin(), input_string.end(), [] (const char &x, const char &y) {
        return x == y and x == ' ';
    });

    input_string.erase(new_end, input_string.end());

    while (input_string[input_string.length() - 1] == ' ') {
        input_string.pop_back();
    }

    vector<string> splits;
    char delimiter = ' ';

    size_t i = 0;
    size_t pos = input_string.find(delimiter);

    while (pos != string::npos) {
        splits.push_back(input_string.substr(i, pos - i));

        i = pos + 1;
        pos = input_string.find(delimiter, i);
    }

    splits.push_back(input_string.substr(i, min(pos, input_string.length()) - i + 1));

    return splits;
}