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  • 6. ZigZag Conversion(js)

    6. 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   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 s, int numRows);

    Example 1:

    Input: s = "PAYPALISHIRING", numRows = 3
    Output: "PAHNAPLSIIGYIR"
    

    Example 2:

    Input: s = "PAYPALISHIRING", numRows = 4
    Output: "PINALSIGYAHRPI"
    Explanation:
    
    P     I    N
    A   L S  I G
    Y A   H R
    P     I
    题意:将给定字符串字符排列成给定的图形,给定行数
    代码如下(js):
    var convert = function(s, numRows) {
        if(s.length==1 || numRows==0 || numRows==1){
            return s;
        }
        var len=s.length;
        var stepLen=2*(numRows-1);
        var str='';
        //纵向
        for(var i=0;i<numRows;i++){
            //横向遍历 步长为stepLen
            for(var j=i;j<len;j+=stepLen){
                str+=s.charAt(j);
                //只有一个元素的列
                if(i!=0 && i!=numRows-1 && j-2*i+stepLen<len){
                    str+=s.charAt(j-2*i+stepLen)
                }
            }
        }
        return str;
    };
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  • 原文地址:https://www.cnblogs.com/xingguozhiming/p/10380606.html
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