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  1. #include <iostream>
  2. #include <set>
  3. #include <utility>
  4. #include <iomanip>
  5. using namespace std;
  6.  
  7. bool isPathCrossing(string s) {
  8.     set <pair <int, int>> st;
  9.     int x = 0, y = 0;
  10.     st.insert(make_pair(x,y));
  11.     for(int i = 0; i < s.size(); i++) {
  12.         if(s[i] == 'N') y++;
  13.         else if(s[i] == 'W') x--;
  14.         else if(s[i] == 'S') y--;
  15.         else x++;
  16.         pair <int, int> pr = make_pair(x, y);
  17.         if(st.find(pr) != st.end()) return true;
  18.         st.insert(pr);
  19.     } 
  20.     return false;
  21. }  
  22.  
  23. int main() {
  24. 	cout << boolalpha;
  25. 	cout << isPathCrossing("NES") << endl;
  26. 	cout << isPathCrossing("NESWW") << endl;
  27. 	return 0;
  28. }
Success #stdin #stdout 0.01s 5280KB
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stdin
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Standard input is empty
stdout
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false
true
https://ideone.com/6Shgwx
language:
C++ (gcc 8.3)
created:
2 years ago
visibility:
secret

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