POJ 1119 Start Up the Startup G++

#include <iostream> #include <cstdio> #include <map> #include <string> #include <cmath> #include <iomanip> using namespace std; //英语 看博友分析 抄博友程序 string fun(string s) { string t=""; for(int i=0;i<s.size();i++) { if(s[i]>='A' && s[i]<='Z') { char c=s[i]-'A'+'a'; t=t+c; }else if(s[i]>='a' && s[i]<='z') { t=t+s[i]; }else if(s[i]>='0' && s[i]<='9') { t=t+s[i]; } } return t; } map<string,int> mp; map<string,int> hs; int main() { string s; while(1) { cin>>s; if(s=="----------") { break; } if(fun(s)!="") { mp[fun(s)]++;// } } while(1) { hs.clear(); cin>>s; if(s=="----------") { break; } if(fun(s)!="") { hs[fun(s)]++; } while(1) { cin>>s; if(s=="----------") { double jg=0; for(map<string,int> :: iterator it=mp.begin();it!=mp.end();it++) { jg=jg+sqrt((double)hs[it->first]*(double)it->second); } cout<<fixed<<setprecision(2)<<jg<<endl; break; } if(fun(s)!="") { hs[fun(s)]++; } } } return 0; }