1001 A+B Format （20 分)

 

Calculate a+b and output the sum in standard format -- that is, the digits must be separated into groups of three by commas (unless there are less than four digits).

Input Specification:

Each input file contains one test case. Each case contains a pair of integers a and b where −. The numbers are separated by a space.

Output Specification:

For each test case, you should output the sum of a and b in one line. The sum must be written in the standard format.

Sample Input:

-1000000 9

Sample Output:

-999,991

#include
        
         #include
         
          #include
          
           #include
           
            #include
            
             using namespace std;typedef long long ll;int main(){    ll a,b;    cin >> a >> b;    ll c = a+b;    if(c == 0){cout << 0;return 0;}    if(c<0){        cout << "-";        c = -c;    }    vector
             
               vec; int cnt = 0; while(c){ if(cnt%3 == 0)vec.push_back(-1); vec.push_back(c%10); c = c/10; cnt++; } for(int i=vec.size()-1;i>0;i--){ if(vec[i]==-1)cout << ","; else cout << vec[i]; }// for(auto num:vec) cout << num << " "; return 0;}
             
            
           
          
         
        

都用leetcode风格写，nice！