Commit a68cf97

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Merge pull request #33 from jxdeng3989/master

zig zag cpp code

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	`1`	`+// @ID:6. ZigZag Conversion`
	`2`	`+// @author:jxdeng3989`
	`3`	`+`
	`4`	`+class Solution {`
	`5`	`+public:`
	`6`	`+ string convert(string s, int numRows) {`
	`7`	`+ string retstr;`
	`8`	`+ if(1==numRows)`
	`9`	`+ return s;`
	`10`	`+ for(int i=0; i<numRows; ++i)`
	`11`	`+ {`
	`12`	`+ retstr.push_back(s[i]);`
	`13`	`+ int maxspan = 2*(numRows-1);`
	`14`	`+ int span1 = maxspan-i*2;`
	`15`	`+ int span2 = maxspan - span1;`
	`16`	`+ int cntpos = i;`
	`17`	`+ if(span1==0)`
	`18`	`+ span1 = span2;`
	`19`	`+ if(span2==0)`
	`20`	`+ span2 = span1;`
	`21`	`+ while(1)`
	`22`	`+ {`
	`23`	`+ if(cntpos+span1>=s.size())`
	`24`	`+ break;`
	`25`	`+ cntpos += span1;`
	`26`	`+ retstr.push_back(s[cntpos]);`
	`27`	`+`
	`28`	`+ if(cntpos+span2>=s.size())`
	`29`	`+ break;`
	`30`	`+ cntpos += span2;`
	`31`	`+ retstr.push_back(s[cntpos]);`
	`32`	`+ }`
	`33`	`+ }`
	`34`	`+ return retstr;`
	`35`	`+ }`
	`36`	`+};`

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