Submission #1215207

#	Time	Username	Problem	Language	Result	Execution time	Memory
1215207		mychecksedad	Constellation 3 (JOI20_constellation3)	C++20	100 / 100	391 ms	62160 KiB

constellation3

/* Author : Mychecksdead  */
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define pb push_back
#define all(x) x.begin(), x.end()
#define en cout << '\n'
#define ff first
#define ss second
#define pii pair<int,int>
#define vi vector<int>
const int N = 1e6+100, M = 1e5+10, K = 52, MX = 30;


int n, a[N], m, L[N], R[N];
array<ll, 2> b[N];
vector<array<ll, 2>> V[N];
ll T[N], lazy[N]; // range max, range add

void build(int sz){
  for(int i = 0; i < 4*sz; ++i) T[i] = lazy[i] = 0;
}
void push(int k){
  lazy[k<<1] += lazy[k];
  lazy[k<<1|1] += lazy[k];
  T[k<<1|1] += lazy[k];
  T[k<<1] += lazy[k];
  lazy[k] = 0;
}
void upd(int l, int r, int ql, int qr, int k, ll val){
  if(ql > r || l > qr) return;
  if(ql <= l && r <= qr){
    T[k] += val;
    lazy[k] += val;
    return;
  }
  push(k);
  int mid = l+r>>1;
  upd(l, mid, ql, qr, k<<1, val);
  upd(mid+1, r, ql, qr, k<<1|1, val);
  T[k] = max(T[k<<1], T[k<<1|1]);
}

ll get(int l, int r, int ql, int qr, int k){
  if(ql > r || l > qr) return 0ll;
  if(ql <= l && r <= qr){
    return T[k];
  }
  push(k);
  int mid = l+r>>1;
  return max(get(l, mid, ql, qr, k<<1), get(mid+1, r, ql, qr, k<<1|1));
}


void solve(){
  cin >> n;
  for(int i = 1; i <= n; ++i){
    cin >> a[i];
  }

  L[1] = 0;
  for(int i = 2; i <= n; ++i){
    L[i] = i - 1;
    while(L[i] > 0 && a[L[i]] <= a[i]) L[i] = L[L[i]];
  }


  R[n] = n + 1;
  for(int i = n - 1; i >= 1; --i){
    R[i] = i + 1;
    while(R[i] < n + 1 && a[R[i]] < a[i]) R[i] = R[R[i]];
  }

  ll ans = 0;
  cin >> m;
  for(int i = 1; i <= m; ++i){
    int x; cin >> x >> b[i][0] >> b[i][1];
    V[x].pb({b[i][0], b[i][1]});
    ans += b[i][1];
  }

  vector<array<ll, 3>> pts;
  for(int i = 1; i <= n; ++i){
    V[i].pb({a[i] + 1, 0});
    sort(all(V[i]));

    vector<array<ll, 2>> TT;
    for(int j = 0; j < V[i].size(); ++j){
      if(j == 0 || TT.back()[1] < V[i][j][1]) TT.pb(V[i][j]);
    }
    V[i].swap(TT);
    ll last = 0;
    for(auto [y, C]: V[i]){
      pts.pb({y, C - last, i});
      last = C;
    }
  }
  sort(all(pts));

  build(n);

  for(auto [y, C, i]: pts){
    if(y == a[i] + 1 && C == 0){
      ll l_dp = get(1, n, L[i] + 1, i, 1);
      ll r_dp = get(1, n, i, R[i] - 1, 1);
      upd(1, n, L[i] + 1, i, 1, r_dp);
      upd(1, n, i, R[i] - 1, 1, l_dp);
      // cerr << y << ' ' << i << ' ' << l_dp << ' ' << r_dp
    }
    upd(1, n, i, i, 1, C);
  }
  cout << ans - T[1];
}


int main(){
  cin.tie(0); ios::sync_with_stdio(0);
  int tt = 1, aa;
  // freopen("in.txt", "r", stdin);
  // freopen("out.txt", "w", stdout);
  while(tt--){
    solve();
    en;
  }
  cerr<<"time taken : "<<(float)clock()/CLOCKS_PER_SEC<<" seconds\n";
  return 0;
} 

• Subtask 1: 14 / 14
• Subtask 2: 21 / 21
• Subtask 3: 65 / 65