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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 −106≤a,b≤106. 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
结尾无空行Sample Output:-999,991
结尾无空行#include
using namespace std;
int main()
{
int a, b;
cin >> a >> b;
string s = to_string(a + b);
int len = s.length();
for (int i = 0; i < len; i++)
{
cout |