Submission #821323

#	Time	Username	Problem	Language	Result	Execution time	Memory
821323		makanhulia	Lasers (NOI19_lasers)	C++17	100 / 100	282 ms	45004 KiB

lasers

#include <bits/stdc++.h>
#define ll long long
#define longlonginf LONG_LONG_MAX
using namespace std;

ll n,m,x;
ll l,r;

void solve(){
  cin>>n;
  cin>>m;
  vector<vector<ll>> v(m+5);
  ll rem[m+5];
  memset(rem,0,sizeof(rem));
  for(int i = 0 ; i < m ; i++){
    cin>>x;
    while(x--){
      ll k;
      cin>>k;
      v[i].push_back(k);
      rem[i] += k;
    }
    rem[i] = n-rem[i];
  }
  vector<pair<ll,ll>> p;
  for(int i = 0 ; i < m ; i++){
    ll k = 0;
    for(auto x : v[i]){
      r = k+x;
      l = k+1;
      if( l+rem[i]-1 < r ){
        p.push_back({l+rem[i],r});
        //cout<<"{"<<l+rem[i]<<","<<r<<"} ";
      }
      k += x;
    }
    //cout<<"\n";
  }
  if( p.empty() ){
    cout<<0<<"\n";
    return;
  }
  sort(p.begin(),p.end());
  p.push_back({longlonginf,longlonginf});
  ll cur = p[0].first;
  ll mx = p[0].second;
  ll ans = 0;
  for(auto x : p){
    if( x.first <= mx ){
      mx = max(mx,x.second);
    }
    else{
      //cout<<"! "<<cur<<" "<<mx<<"\n";
      ans += mx-cur+1;
      cur = x.first;
      mx = max(mx,x.second);
    }
  }
  cout<<ans<<"\n";
}

int main(){
  int T = 1;
  //cin>>T;
  for(int i = 1 ; i <= T ; i++){
    solve();
  }
  return 0;
}

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