题解 | #牛牛的替换#

知识点：

函数：函数

#include <iostream>
using namespace std;

void replace(char* arr, int n, char o, char r);

int main() {
    int n;
    char a1, a2, a3, a4;
    cin >> n >> a1 >> a2 >> a3 >> a4;
    char arr[n];

    for (int i = 0; i < n; i++) {
        cin >> arr[i];
    }

    replace(arr, n, a1, a2);
    replace(arr, n, a3, a4);

    for (int i = 0; i < n; i++) {
        cout << arr[i];
    }
    cout << endl;

    return 0;
}

void replace(char* arr, int n, char o, char r) {
    for (int i = 0; i < n; i++) {
        if (arr[i] == o) {
            arr[i] = r;
        }
    }
}