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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. #define pb push_back
  5. #define yes cout<<"YES\n";
  6. #define no cout<<"NO\n";
  7. const int N=3e5+7;
  8. ll T = 1, a[N], b[N];
  9. void solve()
  10. {
  11.     ll n, m;
  12.  
  13.     cin >> n >> m;
  14.  
  15.     for(int i = 1; i <= n; i++)
  16.         cin >> a[i];
  17.  
  18.     int mn = n + 1, l = 1;
  19.     ll sum = 0;
  20.  
  21.     for(int r = 1; r <= n; r++){
  22.         sum += a[r];
  23.  
  24.         while(l <= r && sum - a[l] >= m)
  25.             sum -= a[l], l++;
  26.  
  27.         if(sum >= m)
  28.         mn = min(mn, r - l + 1);
  29.     }
  30.  
  31.     if(mn == n + 1)
  32.         mn = -1;
  33.  
  34.     cout << mn;
  35. }
  36. int main()
  37. {
  38.     ios::sync_with_stdio(NULL);
  39.     cin.tie(0);
  40.     cout.tie(0);
  41.  
  42. //    freopen("","r", stdin);
  43. //    freopen("","w", stdout);
  44. //    cin>>T;
  45.     while(T--)
  46.         solve();
  47.     return 0;
  48. }
  49.  
Success #stdin #stdout 0.01s 5708KB
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stdin
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7 20
2 6 4 3 6 8 9
stdout
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3
https://ideone.com/D00eHN
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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