#include <stdio.h> #include <string.h> int main() { int n, m; scanf("%d %d", &n, &m); char zifuchuan[n]; scanf("%s", zifuchuan); while (m--) { int l, r; char c1, c2; scanf("%d %d %c %c", &l, &r, &c1, &c2); if (l < 0) { l = 0; } if ...