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以字符串的形式给定两个数字,返回相乘的结果,注意:结果也是字符串,因为数字可能很大
Given two numbers represented as strings, return multiplication of the numbers as a string.
Note: The numbers can be arbitrarily large and are non-negative.
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分析:
代码注释已经很详细,模拟手算即可
//思路首先:
//模拟手算过程即可
class Solution {
public:
string multiply(string num1, string num2) {
int allLen=num1.size()+num2.size();
vector<int> tmpresult(allLen,0);
string result(allLen,'0');
//模拟手算从最后一位开始处理
for(int i=num1.size()-1;i>=0;i--)
{
int n1=num1[i]-'0';
for(int j=num2.size()-1;j>=0;j--)
{
int n2=num2[j]-'0';
tmpresult[i+j+1]+= n1*n2;
}
}
//进位
for(int i=allLen-1;i>0;i--)
{
while(tmpresult[i]>9)
{
tmpresult[i-1]+=tmpresult[i]/10;
tmpresult[i]%=10;
}
}
//转换成字符串
for(int i=allLen-1;i>=0;i--)
result[i]=tmpresult[i]+'0';
if(result.find_first_not_of('0') == string::npos)
return "0";//排除全0的情况
return result.substr(result.find_first_not_of('0'),string::npos);
}
};注:本博文为EbowTang原创,后续可能继续更新本文。如果转载,请务必复制本条信息!
原文地址:http://blog.csdn.net/ebowtang/article/details/50575524
原作者博客:http://blog.csdn.net/ebowtang
<LeetCode OJ> 43. Multiply Strings
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原文地址:http://blog.csdn.net/ebowtang/article/details/50575524