Given two non-negative integers num1 and num2 rePResented as string, return the sum of num1 and num2.
Note:
The length of both num1 and num2 is < 5100.Both num1 and num2 contains only digits 0-9.Both num1 and num2 does not contain any leading zero.You must not use any built-in BigInteger library or convert the inputs to integer directly.class Solution {public: string addStrings(string num1, string num2) { string ans; int c = 0, i, j; for(i = num1.length() - 1, j = num2.length() - 1; i >= 0 && j >= 0; --i, --j){ int s = (num1[i] - '0') + (num2[j] - '0') + c; ans.push_back(s % 10 + '0'); c = s / 10; } while(i >= 0){ int s = (num1[i] - '0') + c; ans.push_back(s % 10 + '0'); c = s / 10; --i; } while(j >= 0){ int s = (num2[j] - '0') + c; ans.push_back(s % 10 + '0'); c = s / 10; --j; } if(c) ans.push_back(c + '0'); reverse(ans.begin(), ans.end()); return ans; }};新聞熱點
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