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  • Java tips

    import java.util.*;
    import java.*;
    import java.math.*;
    public class Main {
        public static  BigInteger xx(BigInteger y) {    
            return y.multiply(BigInteger.valueOf(3));
        } 
        public static void main(String[] args) {
            // TODO Auto-generated method stub
            Scanner cin = new Scanner(System.in);
            int t = cin.nextInt();
            int k,top;
            for (int tt=0;tt<t;++tt){
                k = cin.nextInt();
                top = cin.nextInt();
                String s = cin.nextLine();
                char[] ss=s.toCharArray();//string修改单个字符先转成char数组
                ss[0] =  '0';
                s = ss.toString();//再转回去
                BigDecimal x = new BigDecimal(ss);
                //s.charAt(0) = '0';
                //System.out.println(k+" "+ss+" "+top);
                System.out.println(x);
                System.out.println(xx(BigInteger.valueOf(3)));
            }
        }
    
    }
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  • 原文地址:https://www.cnblogs.com/agenthtb/p/8979061.html
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