编号转换

#include <iostream>#include <stdlib.h>#include <vector>#include <string> #include <cctype>using namespace std;bool isrc(string &s){    if(s.size()<2) return false;    if(!(s[0]=='R'&&isdigit(s[1]))) return 0;    int i=1;    while(i<s.size()&&s[i]!='C') i++;    if(i==s.size()) return 0;    return 1;}string int2str(int num){    string s="";    while(num)    {        int i=num%26;        if(i==0)         {            char c='Z';            s=c+s;            num=num/26-1;        }else        {            char c='A'+num%26-1;            num/=26;            s=c+s;        }       }    return s;}string rc2(string &rc){    string ans=" ";    int i=1;    while(rc[i]!='C') i++;     int col=atoi(rc.substr(i+1).c_str());    string s=int2str(col);s+=rc.substr(1,i-1);    return s;}string fun(int num){    string s="";    while(num)    {        char c='0'+num%10;        s=c+s;        num/=10;    }    return s;}string i2rc(string &s){    int i=0;int col=0;    while(!isdigit(s[i])) {        col=col*26+(s[i]-'A'+1); i++;    }    string r="R";    r+=s.substr(i); r+="C";    r+=fun(col);    return r;}int main(){//  string rc="R23C52",i="BC23";//  cout<<rc2(rc)<<endl; // cout<<i2rc(i);  int n;cin>>n;  for(int i=0;i<n;i++)  {    string rc,s;    cin>>rc;    if(isrc(rc)) s=rc2(rc);    else s=i2rc(rc);    cout<<s<<endl;  }}