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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. int consistency(int n, int k){
  33.  
  34.     if(k&1) return 0;
  35.  
  36.     int val = k/2;
  37.  
  38.     int ct1 = 0; //* count(<val)
  39.     int ct2 = 0; //* count(< (-val))
  40.  
  41.     for(int i=0; i<n; i++){
  42.         if(  abs(a[i]) < val ) ct1++;
  43.         if(abs(a[i]) == val) ct2++;
  44.     }
  45.  
  46.     int ans = ct1*ct2;
  47.     ans += ct2*(ct2-1)/2;
  48.  
  49.     return ans;
  50.  
  51. }
  52.  
  53.  
  54.  
  55.  
  56.  
  57.  
  58.  
  59.  
  60.  
  61.  
  62.  
  63.  
  64.  
  65.  
  66.  
  67. int practice(int n, int k){
  68.  
  69.  
  70.     return 0;
  71. }
  72.  
  73.  
  74.  
  75.  
  76.  
  77. void solve() {
  78.  
  79.     int n, k;
  80.     cin>> n >> k;
  81.  
  82.     a.resize(n);
  83.     for(int i=0; i<n; i++) cin >> a[i];
  84.  
  85.     cout << consistency(n, k) << endl;
  86.  
  87.  
  88. }
  89.  
  90.  
  91.  
  92.  
  93.  
  94. int32_t main() {
  95.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  96.  
  97.     int t = 1;
  98.     cin >> t;
  99.     while (t--) {
  100.         solve();
  101.     }
  102.  
  103.     return 0;
  104. }
Success #stdin #stdout 0.01s 5268KB
comments (?)
stdin
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3
4 2
1 3 2 0
4 4
1 4 -1 2
15 10
-12 -10 -4 -5 -5 -1 2 3 5 5 5 5 8 10 13
stdout
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1
2
39
https://ideone.com/dj6Ql3
language:
C++14 (gcc 8.3)
created:
16 hours ago
visibility:
public

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