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64. ZigZag Conversion
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 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"
.
思路:
方法1: 刚开始正着方三个,然后反着放两个,正着放两个。直到结束。(优)
class Solution {public: string convert(string s, int nRows) { if(nRows <= 1 || s == "") return s; int len = s.length(); string s2[nRows]; int k = 0, k2 = 0; while(k2 < len){ while(k < nRows && k2 < len) s2[k++].push_back(s[k2++]); k--; while(k > 0 && k2 < len) s2[--k].push_back(s[k2++]); k++; } string s3; for(int i = 0; i < nRows; ++i) { s3 += s2[i]; } return s3; }};
方法二: 类似方法一,不过存下每个位置的字符应该放的地方。然后依次读入。
class Solution {public: string convert(string s, int nRows) { if(nRows <= 1 || s == "") return s; int len = s.length(); vector<int> index(2*nRows-2); int t = 0; for(int i = 0; i < nRows; ++i) index[t++] = i; for(int j = nRows-2; j > 0; --j) index[t++] = j; string s2[nRows]; int k = 0, m = 2*(nRows-1); while(k < len){ s2[index[k % m]].push_back(s[k]); k++; } string s3; for(int i = 0; i < nRows; ++i) { s3 += s2[i]; } return s3; }};
64. ZigZag Conversion
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