">int main() { int n = 0; int m = 0; scanf("%d %d",&n,&m); char s[n]; scanf("%s",&s); int i = 0; int l = 0,r = 0; char c1,c2; int flag = 1; for(i = 0;i<m;i++)//输入m行 { int j = 0; scanf("%d %d %c %c",&l,&r,&c1,&c2); for(j = l-1;j<r;j++)//直接把字符串改了 { if(s[j]==c1) { s[j]...