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solved leetcode daily challenge, array nesting

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	`1`	`+#include <bits/stdc++.h>`
	`2`	`+#include <gtest/gtest.h>`
	`3`	`+using namespace std;`
	`4`	`+`
	`5`	`+`
	`6`	`+//// START`
	`7`	`+/*`
	`8`	`+## Array Nesting`
	`9`	`+`
	`10`	`+*/`
	`11`	`+class Solution {`
	`12`	`+ public:`
	`13`	`+ int arrayNesting(vector<int>& nums) {`
	`14`	`+ unordered_map<int,bool> visited;`
	`15`	`+ int ret= 0;`
	`16`	`+ for (int i = 0; i < nums.size();i++){`
	`17`	`+ if (visited[nums[i]]) continue;`
	`18`	`+ visited[nums[i]]=true;`
	`19`	`+ int length = 1;`
	`20`	`+ int last = nums[i];`
	`21`	`+ while(1){`
	`22`	`+ if (!visited[nums[last]]){`
	`23`	`+ visited[nums[last]]=true;`
	`24`	`+ last = nums[last];`
	`25`	`+ length++;`
	`26`	`+ }else{`
	`27`	`+ break;`
	`28`	`+ }`
	`29`	`+ }`
	`30`	`+ ret = max(ret,length);`
	`31`	`+ }`
	`32`	`+ return ret;`
	`33`	`+ }`
	`34`	`+};`
	`35`	`+`
	`36`	`+`
	`37`	`+`
	`38`	`+`
	`39`	`+//// END`
	`40`	`+struct T{`
	`41`	`+`
	`42`	`+};`
	`43`	`+`
	`44`	`+TEST(Solution,test){`
	`45`	`+ T ts[] = {`
	`46`	`+ {`
	`47`	`+`
	`48`	`+ },`
	`49`	`+ {`
	`50`	`+`
	`51`	`+ },`
	`52`	`+`
	`53`	`+ };`
	`54`	`+`
	`55`	`+`
	`56`	`+ for (T t : ts){`
	`57`	`+ Solution solution;`
	`58`	`+`
	`59`	`+ }`
	`60`	`+}`
	`61`	`+`
	`62`	`+int main() {`
	`63`	`+ testing::InitGoogleTest();`
	`64`	`+`
	`65`	`+ return RUN_ALL_TESTS();`
	`66`	`+}`
	`67`	`+`
	`68`	`+`

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