J 计算A+B 大数

https://ac.nowcoder.com/acm/contest/4462/J

 

 有前导0是可以的

 

import java.math.BigInteger;
import java.util.Scanner;

public class Main {
    public static  void solve(String m){
        char p[]=m.toCharArray();
        for(int i=0;i<m.length();i++){
            if((p[i]<'0'||p[i]>'9')&&p[i]!='+') {
                System.out.println("skipped");
                return;
            }
        }
        if(p[0]=='+'||p[m.length()-1]=='+'){
            System.out.println("skipped");
            return;
        }
        int index=0;
        int cnt=0;
        for(int i=1;i<m.length()-1;i++){
            if(p[i]=='+'){
                cnt++;
                index=i;
            }
        }
        if(cnt==0||cnt>1){
            System.out.println("skipped");
            return;
        }
        BigInteger a= new BigInteger(m.substring(0,index));
        BigInteger b= new BigInteger(m.substring(index+1));
        a=a.add(b);
        String c=a+"";
        System.out.println(c);
 
    }
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int n = input.nextInt();
        for(int i=1;i<=n;i++){
            String m = input.next();
            solve(m);
        }

    }
}