leetcode-6- ZigZag Conversion

难度

medium

描述

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   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".

解答

class Solution {
public:string convert(string s, int numRows) {vector<string> vs(numRows, "");int n = s.length(), i = 0;while (i < n) {for (int j = 0; j < numRows && i < n; j++)vs[j].push_back(s[i++]);for (int j = numRows - 2; j >= 1 && i < n; j--)vs[j].push_back(s[i++]);}string zigzag;for (string v : vs) zigzag += v;return zigzag;}
};

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leetcode-6- ZigZag Conversion

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