Submission #1007939

#	Time	Username	Problem	Language	Result	Execution time	Memory
1007939		devariaota	Lasers (NOI19_lasers)	C++17	10 / 100	12 ms	6748 KiB

lasers

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define pp pop_back
#define fi first
#define se second
#define lb lower_bound
#define ub upper_bound
#define pll pair<ll,ll> 
#define pii pair<int,int> 
#define vl vector<ll> 
#define nikah ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
const ll maxn = 5e5+7, modn1 = 1e9+7, modn2 = 998244353;
using namespace std;

// kalo kamu ngga emas nanti nadya merasa bersalah, ayo san demi nadya!!!
// Kalo emang soalnya susah, pindah soal dulu 
// Jangan sampe diem, pikirin sesuatu, pasti bisa!!!
// Cobain semua approach, jangan ngestuck di satu pemikiran
// Jangan overthinking, jangan panik, tenangin pikiranmu


ll t,n,q;
ll a[maxn], pref[maxn];

void solve () {
  cin>>n>>q;
  ll ans = 0;
  while (q--) {
    ll k; cin>>k;
    for (ll i=1; i<=k; i++) {
      cin>>a[i];
      pref[i] = a[i] + pref[i-1];
    }
    ll cnt = 0;
    for (ll i=k; i>=1; i--) {
      ll x = pref[i];
      ll y = n - cnt - a[i] + 1;
      if (x >= y) {
        ans += (x-y+1);
      }
      cnt += a[i];
    }
  }
  cout<<ans<<endl;
}           


int main () {
  nikah
  t = 1;
//  cin>>t;
  while (t--) {
    solve();
  //  cout<<endl;
  }
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 14
• Subtask 3: 0 / 20
• Subtask 4: 0 / 21
• Subtask 5: 0 / 22
• Subtask 6: 0 / 13