题解 | #Integer Inquiry#

#include<string>
#include<cstdio>
#include<iostream>
using namespace std;
int main() {
	string str;
	string result1;
	string result = "";
	getline(cin, str);
	getline(cin, result1);
	while (str != "0") {
		int min = result1.size() < str.size() ? result1.size() : str.size();
		int flag = 0, i;
		for (i = 1; i <= min; i++) {
			char x = str[str.size() - i] + result1[result1.size() - i] + flag - '0';
			if ( x > '9') {
				flag = 1;
				x -= 10;
				result = x + result;
			}
			else {
				result = x + result;
				flag = 0;
			}
		}
		i--;
		//printf("***%s\n", result.c_str());
		while (i < result1.size()) {
			char x = result1[result1.size() - i-1] + flag;
			if (x > '9') {
				flag = 1;
				result = '0'+ result;
			}
			else {
				result = x + result ;
				flag = 0;
			}
			i++;
		}

		while (i < str.size()) {
			char x = str[str.size() - i-1] + flag;
			if (x > '9') {
				flag = 1;
				result = '0' + result;
			}
			else {
				result = x+ result ;
				flag = 0;
			}
			i++;
		}
 		if (flag == 1)
			result = '1' + result;
		result1 = result;
		
		result = "";
		getline(cin, str);
	}
	printf("%s\n", result1.c_str());
}