백준 11575번: Affine Cipher

https://www.acmicpc.net/problem/11575

1. 문제

2. 알고리즘

키워드 - 구현

3. 코드

#include <iostream>
#include <sstream>
#include <string>
#include <algorithm>
#include <functional>
#include <vector>
#include <list>
#include <queue>
#include <deque>
#include <map>
#include <set>
#include <stack>
#include <math.h>
#include <memory.h>
using namespace std;
 
#define MAX_SIZE 100
#define INF 0x7fffffff
#define CENDL "\n"
#define ll long long
 
#define c_reverse(s) reverse(s.begin(), s.end())
#define c_sort(s) sort(s.begin(), s.end())
 
#define print_vector(v) for(int i=0; i<v.size(); i++) cout << v[i];
 
int cipher(int index, int a, int b) {
    return ((a * index) + b) % 26;
}
 
int main() {
 
    cin.tie(0);
    std::ios::sync_with_stdio(false);
 
    int n; cin >> n;
 
    while(n--) {
        int e, c; cin >> e >> c;
        string s; cin >> s;
 
        const int size = s.size();
        for (int i=0; i<size; i++) {
            int cand = cipher(s[i] - 'A', e, c);
            cout << char('A' + cand);
        }
        cout << CENDL;
    }
 
    return 0; 
}