poj 2273 An Excel

#include<cstdio>#include<cstring>#include<algorithm>using namespace std;int main(){    char s[30];    while(gets(s)&&strcmp(s,"R0C0")!=0)    {        int m=0,i;        for(i=1;s[i]!='C';i++);        s[i]='';        for(++i;s[i]!='';i++) m=m*10+s[i]-'0';        char ans[30];        m--;        for(i=0;m>=0;i++)        { ans[i]=m%26+'A'; m=m/26-1;        }        ans[i]='';        reverse(ans,ans+i);        printf("%s%sn",ans,s+1);    }    return 0;}