模板生成系统

//刚开始写只有50分    因为读入变量的值的时候可能存在空格，用流读的话，会将空格忽略，

#include <iostream>
#include <string>
#include <vector>
#include <map>
#include <cstdio>
#include <sstream>
using namespace std;

int main() {
	int n, m;
	vector<string> v;

	map<string, string> dict;

	int pre, nxt;

	cin >> n >> m;

	cin.get();
	
	string tmp, s1, s2;
	
	for(int i=1; i<=n; i++) {
		getline(cin, tmp);

		v.push_back(tmp);
	}

	for(int i=1; i<=m; i++) {
		/*string s;
		getline(cin, s);

		stringstream ss(s);

		ss >> s1;
		ss >> s2;//s2可能存在“  ”

		dict[s1] = s2.substr(1, s2.length()-2);//去掉“”*/
		cin >> s1;
		getline(cin, s2);
		dict[s1] = s2.substr(2, s2.length()-3);//因为s2读入“ ” 
	}

	for(int i=0; i<n; i++) {
		pre = 0;
		while((pre = v[i].find("{{ ", pre)) != string::npos &&(nxt = v[i].find(" }}", pre)) != string::npos) {
			s1 = v[i].substr(pre + 3, nxt - pre - 3);
			v[i].replace(pre, nxt - pre + 3, dict[s1]);
			pre +=  dict[s1].length();  //继续向后查询
		}
		cout << v[i] << endl;
	}
	return 0;
}