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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.  
  31.  
  32. vector<int> a;
  33.  
  34. int consistency(int n, int k) {
  35.     int sum = 0;
  36.     unordered_map<int,int> mp = {{0, -1}};
  37.     int maxLen = 0;
  38.  
  39.     for(int R=0; R<n; R++){
  40.         sum += a[R];
  41.         if(mp.count(sum-k)){
  42.             int L = mp[sum-k];
  43.             int len = R-L;
  44.             maxLen = max(maxLen, len);
  45.         }
  46.         if(!mp.count(sum)) mp[sum] = R;
  47.     }
  48.  
  49.     return maxLen;
  50. }
  51.  
  52.  
  53.  
  54.  
  55.  
  56.  
  57.  
  58.  
  59.  
  60.  
  61.  
  62.  
  63.  
  64.  
  65.  
  66. int practice(int n, int k){
  67.  
  68.  
  69.     return 0;
  70. }
  71.  
  72.  
  73.  
  74.  
  75.  
  76. void solve() {
  77.  
  78.     int n, k;
  79.     cin >> n >> k;
  80.  
  81.     a.resize(n);
  82.     for(int i=0; i<n; i++) cin >> a[i];
  83.  
  84.     cout << consistency(n, k) << endl ;
  85.  
  86. }
  87.  
  88.  
  89.  
  90.  
  91.  
  92.  
  93. int32_t main() {
  94.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  95.  
  96.     int t = 1;
  97.     // cin >> t;
  98.     while (t--) {
  99.         solve();
  100.     }
  101.  
  102.     return 0;
  103. }
Success #stdin #stdout 0.01s 5324KB
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https://ideone.com/R5Qnjp
language:
C++14 (gcc 8.3)
created:
23 hours ago
visibility:
public

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