algorithm/algorithm/src/boj/BaseConvert2745.java at master · Oraindrop/algorithm

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package boj;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.util.StringTokenizer;

public class BaseConvert2745 {

public static void main(String[] args) throws IOException {

// TODO Auto-generated method stub

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

StringTokenizer st = new StringTokenizer(br.readLine());

String s = st.nextToken();

int size = s.length();

int base = Integer.parseInt(st.nextToken());

int answer = 0;

char[] cArr = s.toCharArray();

for (int i = size-1; i >= 0; i--) {

char c = cArr[i];

int mult = 0;

if (c >= 'A' && c <= 'Z') {

mult = c - 'A' + 10;

} else {

mult = c - '0';

}

for (int j = 0; j < size - 1 - i; j++) {

mult *= base;

}

answer += mult;

}

System.out.println(answer);

}