#include <iostream> using namespace std; void f(string &s) { int n = 0; for(auto i = s.begin(); i != s.end() - 1; ++i) { if(*i == '.' && *(i + 1) == '.') ++n; } cout << n << endl; } int main() { int n , m ; int x; char c; while(cin >> n >> m) { string s; for(int i = 0; i < n; ++i) { cin >> c; s.push_back(c); } for(int i = 0; i < m; ++i) { cin >> x >> c; s[x - 1] = c; cout << s << endl; f(s); } } return 0; } 有问题的话相互探讨。0-0