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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define int              long long int
  4. #define double           long double
  5. #define print(a)         for(auto x : a) cout << x << " "; cout << endl
  6.  
  7.  
  8. const int M = 1000000007;
  9. const int N = 3e5+9;
  10. const int INF = 2e9+1;
  11. const int LINF = 2000000000000000001;
  12.  
  13. inline int power(int a, int b, int mod=M) {
  14.     int x = 1;
  15.     a %= mod;
  16.     while (b) {
  17.         if (b & 1) x = (x * a) % mod; 
  18.         a = (a * a) % mod;
  19.         b >>= 1;
  20.     }
  21.     return x;
  22. }
  23.  
  24.  
  25. //_ ***************************** START Below *******************************
  26.  
  27.  
  28.  
  29.  
  30. vector<int> a;
  31.  
  32. bool consistency(int n){
  33. 	int count = 0;
  34.  
  35. 	unordered_map<int,int> prefixMap, sufixMap;
  36.  
  37. 	for(int i=n-1; i>=0; i--){
  38. 		sufixMap[a[i]]++;
  39. 	}
  40.  
  41. 	for(int j = 1; j<=n-2; j++){
  42.  
  43. 		if(prefixMap.count(a[j]-1) && sufixMap.count(a[j]+1)) return true;
  44. 		prefixMap[a[j]]++;
  45. 		sufixMap[a[j]]--;
  46. 		if(sufixMap[a[j]] == 0) sufixMap.erase(a[j]);
  47. 	}
  48.  
  49. 	return false;
  50. }
  51.  
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  69.  
  70.  
  71. bool practice(int n){
  72.  
  73.  
  74.     return 0;
  75. }
  76.  
  77.  
  78.  
  79.  
  80.  
  81. void solve() {
  82.  
  83.     int n;
  84.     cin>> n;
  85.  
  86.     a.resize(n);
  87.     for(int i=0; i<n; i++) cin >> a[i];
  88.  
  89.     cout << consistency(n) << endl;
  90.  
  91.  
  92. }
  93.  
  94.  
  95.  
  96.  
  97.  
  98. int32_t main() {
  99.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  100.  
  101.     int t = 1;
  102.     cin >> t;
  103.     while (t--) {
  104.         solve();
  105.     }
  106.  
  107.     return 0;
  108. }
Success #stdin #stdout 0s 5316KB
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https://ideone.com/b9LZWK
language:
C++14 (gcc 8.3)
created:
5 hours ago
visibility:
public

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