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 NA P L S I I GY I R
And 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”.
string convert(string s, int nRows) { if(s.size() <= 1 || nRows <= 1) return s; int gap = 2*nRows-2; string res = ""; for(int i=0; i<nRows; i++){ for(int j=i; j<s.size(); j+=gap){ res += s[j]; //画图，e.g: nRows = 3 or 4 if(i>0 && i<nRows-1 && j+gap-2*i < s.size()){ res += s[j+gap-2*i]; } } } return res;}
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