大數乘法 leetcode 43. Multiply Strings

阿新 • • 發佈：2019-01-23

class Solution {
    public:
        string multiply(string num1, string num2) {
            int len1 = num1.length();
            int len2 = num2.length();
            string result(len1+len2, '0');
            int cal = 0,tmp = 0;
            if( num1=="0" || num2 =="0") return "0";
            for(int i = 
 len1 - 1; i >= 0; --i)
            {   
                for(int j = len2 - 1; j >= 0; --j)
                {   
                    tmp = (result.at(i+j+1)-'0') + (num1.at(i) - '0') * (num2.at(j) - '0')+ cal;
                    result.at(i+j+1) = ( tmp % 10) +'0';
                    cal = tmp / 10;
                    if 
(i ==0 && j ==0 && cal !=0)
                    {   
                        result.at(0) = cal + '0';
                        cal = 0;
                    } else if(j == 0 && cal !=0)
                    {   
                        result.at(i) = cal +'0';
                        cal = 
 0;
                    }       
                }       
            }       
            if(result.at(0) == '0')
            {   
                result.erase(0,1);
            }                                                                                    
            return result;
        }       
};

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class Solution { public: string multiply(string num1, string num2) { int len1

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