C++_USACO_Palindromic Squares

/*
PROB:palsquare
LANG:C++
*/
#include<iostream>
#include<fstream>
#include<sstream>
#include<string>
#include<stack>
#include<math.h>
using namespace std;
const int code[]={10,11,12,13,14,15,16,17,18,19};
    stack<char> rem_stack;
    
//十进制转换成n进制
string transtoN(int num_ten,int base){
    string str_n="";
    int irem=0;
    char crem=' ';
    while(num_ten!=0){
        irem=num_ten%base;
        if(irem<10)
            crem=(char)(irem+48);
        else
            crem=irem-10+'A';
        rem_stack.push(crem);
        num_ten=num_ten/base;
    }
    while(!rem_stack.empty()){
        str_n.append(1,rem_stack.top());
        rem_stack.pop();
    }
    return str_n;
}

int main(){
    ifstream fin("palsquare.in");
    ofstream fout("palsquare.out");
    int base;
    fin>>base;
    string str_n="";
    int i_pals=0;
    string str_pals="";
    bool ispals=true;
    int before_pals=1;
    fout<<1<<" "<<1<<endl;
    for(int i=2;i<=300;i++){
        stringstream ss;
        str_pals="";
        i_pals=before_pals+2*i-1;//n^2=(n-1)^2+2*n-1。。用n-1的平方计算n的平方
        if(base!=10){
            str_n=transtoN(i,base);
            str_pals=transtoN(i_pals,base);
        }
        else{
            ss<<i_pals;
            str_pals=ss.str();
        }
        for(int j=0;j<str_pals.size()/2;j++){
            if(str_pals[j]!=str_pals[str_pals.size()-1-j]){
                ispals=false;
                break;
            }
        }
        if(ispals){
            if(base==10)
                fout<<i<<" "<<str_pals<<endl;
            else
                fout<<str_n<<" "<<str_pals<<endl;
        }
        before_pals=i_pals;
        ispals=true;
    }
    return 0;
}