题目链接:https://leetcode.com/problems/zigzag-conversion/
The string "PAYPALISHIRING"
is written in a zigzag pattern on a given number of rows like
this: (you may want to display this pattern in a fixed font for better legibility)
P A H N A P L S I I G Y I RAnd then read line by line:
"PAHNAPLSIIGYIR"
Write the code that will take a string and make this conversion given a number of rows:
string convert(string text, int nRows);
convert("PAYPALISHIRING", 3)
should
return "PAHNAPLSIIGYIR"
.class Solution{
public:
string convert(string s,int numRows)
{
if(numRows==1)
return s;
int i=0;
vector<string> combinations;
combinations.resize(numRows);
for(i=0;i<numRows;i++)
combinations[i]="";
int len=s.length();
i=0;
int mod=2*numRows-2;
while(i<len)
{
int j=i%mod;
if(j<numRows)
{
combinations[j].push_back(s[i]);
}
else if(j>=numRows)
{
combinations[mod-j].push_back(s[i]);
}
i++;
}
string ex="";
for(i=0;i<numRows;i++)
{
for(char c:combinations[i])
ex.push_back(c);
}
return ex;
}
};