【LeetCode】6. ZigZag Conversion

6. ZigZag Conversion

 

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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".

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向下循环:nRows
斜角线循环:nRows-2(减去首尾两个端点)
重复

string convert(string s, int nRows){    if(nRows == 1) return s;    string res[nRows];    int i = 0, j, gap = nRows-2;    while(i < s.size()){        for(j = 0; i < s.size() && j < nRows; ++j) res[j] += s[i++];        for(j = gap; i < s.size() && j > 0; --j) res[j] += s[i++];    }    string str = "";    for(i = 0; i < nRows; ++i)        str += res[i];    return str;}