http://codegolf.stackexchange.com/questions/86519/array-escape-get-out-of-there

array_escape.cpp

#include <algorithm>
#include <cmath>
#include <iostream>
#include <string>
#include <vector>
using namespace std;using v=std::vector<int>;string escape(v j,int i){v h;do{h.push_back(i);try{if(i<=1?0:!((lround(tgamma(i))+1)%i)){i-=j[i];}else{i=j[i];}}catch(const out_of_range& e){cerr<<i;}}while(find(h.begin(),h.end(),i)!=h.end());return string("false");}