题解 | #字符串操作#

#include <iostream>

using namespace std;

int main()
{
    int n, m;
    cin >> n >> m;
    char s[1000] = { 0 };
    for (int i = 0; i < n; i++)
    {
        cin >> s[i];
    }
    int i = 0;
    int l = 0, r = 0;
    char c1, c2;
    for (i = 0; i < m; i++)
    {
        int j = 0;
        cin >> l >> r >> c1 >> c2;
        for (j = l - 1; j < r; j++)
        {
            if (s[j] == c1)
            {
                s[j] = c2;
            }
        }
    }
    for (int i = 0; i < n; i++)
    {
        cout << s[i];
    }
    cout << endl;
    return 0;
}