[백준] 1212: 8진수 2진수

1212번: 8진수 2진수

#include <cstdio>
#include <string>
#include <iostream>
using namespace std;
string eight[8] = {"000","001","010","011","100","101","110","111"};
int main(){
    string s;
    cin >> s;
    bool start = true;
    if (s.length() == 1 && s[0]-'0' == 0) {
        cout << "0";
    }
    for (int i=0; i<s.length(); i++) {
        int n = s[i]-'0';
        if (start == true && n < 4) {
            if (n == 0) {
                continue;
            } else if(n == 1) {
                cout << "1";
            } else if (n == 2) {
                cout << "10";
            } else if (n == 3) {
                cout << "11";
            }
            start = false;
        } else {
            cout << eight[n];
            start = false;
        }
    }
    return 0;
}