【leetcode】415. Add Strings
problem
solution:
class Solution { public: string addStrings(string num1, string num2) { int i = num1.size()-1; int j = num2.size()-1; int carry = 0; string res = ""; while(i>=0 || j>=0 || carry) { int tmp = ((i<0)?0:(num1[i--]-'0')) + ((j<0)?0:(num2[j--]-'0')) + carry;//注意运算符的优先级顺序. carry = tmp/10; res = to_string(tmp%10) + res; } return carry ? ('1'+res) : res;//err. } };
参考
完