【6】ZigZag Conversion
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找到同一行相邻两个字符间距的规律即可,以numRows=5为例
1 9 ... (0,8)
2 8 10 (6,2)
3 7 11 (4,4)
4 6 12 (2,6)
5 13 (8,0)
string convert(string s, int numRows) { int len=s.length(); if(len<=1 || numRows==1)return s; int gap[2]={2*(numRows-1),0}; string res; for(int i=0;i<numRows;i++){ int index=i; int dir=0; while(index<len){ res+=s[index]; index+=(gap[dir]==0?gap[1-dir]:gap[dir]); dir=1-dir; } gap[0]-=2; gap[1]+=2; } return res;}
0 0
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