题解 | #高精度整数加法#

#include <iostream>

using namespace std;

string bigIntAdd(string s1,string s2){
    string res;
    int i=s1.size()-1,j=s2.size()-1;
    int add,carry = 0;
    while (i>=0 && j>=0) {
        add = (s1[i--]-'0') + (s2[j--]-'0') + carry;
        carry = add / 10;
        res = to_string(add%10) + res;
    }
    while (i>=0){
        add = (s1[i--]-'0') + carry;
        carry = add / 10;
        res = to_string(add%10) + res;
    }
    while (j>=0){
        add = (s2[j--]-'0') + carry;
        carry = add / 10;
        res = to_string(add%10) + res;
    }
    while (carry){
        res = to_string(carry) + res;
        carry = 0;
    }
    return res;
}

int main(){
    string s1,s2;
    while (cin>>s1>>s2){
        cout<<bigIntAdd(s1,s2)<<endl;
    }

    return 0;
}