把之字形的字符横向输出

1 2n-1

2 ... 2n

3 n+2 2n+1

... n+1 ...

n 3n-2

以上为n排之字型字符的结构

string convert(string s,int numRows)

{string result="";  

if(numRows==1)return s;

int a,b;  

for(int i=0;i<numRows;i++)

{a=(numRows-i-1)*2;  

b=(i)*2;  

intposition=i;  

if(position<len)  

result+=s.at(position);  

while(1)

{position+=a;  

if(position>=s.size())  

break;

if(a)

result+=s.at(position);  

position+=b;  

if(position>=s.size())  

break;

if(b)

result+=s.at(position);  

}  

}  

return result;  

}