题解 | #字符串操作#

#include <stdio.h>

int main() {
    int n, m;
    char a;         // 去掉"LF"
    scanf("%d %d", &n, &m);
    char str[n];
    scanf("%c", &a);
    for (int i = 0; i < n; i++) {
        scanf("%c", &str[i]);
    }

    for (int i = 0; i < m; i++) {
        int l, r;
        char c1, c2;
        scanf("%d %d %c %c", &l, &r, &c1, &c2);
        for (int j = l - 1; j < r; j++) {
            if (str[j] == c1) str[j] = c2;
        }
    }
    for (int i = 0; i < n; i++) printf("%c", str[i]);
    return 0;
}