Submission #934185

#	Time	Username	Problem	Language	Result	Execution time	Memory
934185		AdamGS	Two Antennas (JOI19_antennas)	C++17	100 / 100	595 ms	58604 KiB

antennas

#include<bits/stdc++.h>
using namespace std;
typedef long double ld;
typedef long long ll;
#define rep(a, b) for(int a = 0; a < (b); ++a)
#define st first
#define nd second
#define pb push_back
#define all(a) a.begin(), a.end()
const ll INF=1e18+7;
const int LIM=2e5+7;
struct Node {
  ll val, lazy, mi;
};
Node tr[4*LIM];
vector<ll>V[LIM], wlacz[LIM], wylacz[LIM];
ll T[LIM], wynik[LIM], A[LIM], B[LIM], N=1;
pair<ll,ll>pyt[LIM];
void spl(int v) {
  tr[2*v].lazy=max(tr[2*v].lazy, tr[v].lazy);
  tr[2*v+1].lazy=max(tr[2*v+1].lazy, tr[v].lazy);
  tr[2*v].val=max(tr[2*v].val, tr[2*v].lazy-tr[2*v].mi);
  tr[2*v+1].val=max(tr[2*v+1].val, tr[2*v+1].lazy-tr[2*v+1].mi);
  tr[v].lazy=-INF;
}
void maxuj(int v, int l, int r, int a, int b, ll x) {
  if(r<a || b<l) return;
  if(a<=l && r<=b) {
    tr[v].lazy=max(tr[v].lazy, x);
    tr[v].val=max(tr[v].val, tr[v].lazy-tr[v].mi);
    return;
  }
  if(tr[v].lazy!=-INF) spl(v);
  int mid=(l+r)/2;
  maxuj(2*v, l, mid, a, b, x);
  maxuj(2*v+1, mid+1, r, a, b, x);
  tr[v].val=max(tr[2*v].val, tr[2*v+1].val);
  tr[v].mi=min(tr[2*v].mi, tr[2*v+1].mi);
}
void upd(int v, int l, int r, int a, ll x) {
  if(r<a || a<l) return;
  if(l==r) {
    tr[v].mi=x;
    tr[v].lazy=-INF;
    return;
  }
  if(tr[v].lazy!=-INF) spl(v);
  int mid=(l+r)/2;
  upd(2*v, l, mid, a, x);
  upd(2*v+1, mid+1, r, a, x);
  tr[v].val=max(tr[2*v].val, tr[2*v+1].val);
  tr[v].mi=min(tr[2*v].mi, tr[2*v+1].mi);
}
ll cnt(int v, int l, int r, int a, int b) {
  if(r<a || b<l) return -INF;
  if(a<=l && r<=b) return tr[v].val;
  if(tr[v].lazy!=-INF) spl(v);
  int mid=(l+r)/2;
  return max(cnt(2*v, l, mid, a, b), cnt(2*v+1, mid+1, r, a, b));
}
int main() {
  ios_base::sync_with_stdio(0); cin.tie(0);
  ll n;
  cin >> n;
  while(N<n) N*=2;
  rep(i, 2*N) {
    tr[i].val=tr[i].lazy=-INF;
    tr[i].mi=INF;
  }
  rep(i, n) {
    cin >> T[i] >> A[i] >> B[i];
    if(i+A[i]<n) wlacz[i+A[i]].pb(i);
    if(i+B[i]+1<n) wylacz[i+B[i]+1].pb(i);
  }
  ll q;
  cin >> q;
  rep(i, q) {
    cin >> pyt[i].st >> pyt[i].nd; --pyt[i].st; --pyt[i].nd;
    wynik[i]=-1;
    V[pyt[i].nd].pb(i);
  }
  rep(i, n) {
    for(auto j : wlacz[i]) upd(1, 0, N-1, j, T[j]);
    for(auto j : wylacz[i]) upd(1, 0, N-1, j, INF);
    maxuj(1, 0, N-1, i-B[i], i-A[i], T[i]);
    for(auto j : V[i]) wynik[j]=max(wynik[j], cnt(1, 0, N-1, pyt[j].st, pyt[j].nd));
  }
  rep(i, n) {
    V[i].clear();
    wlacz[i].clear();
    wylacz[i].clear();
  }
  rep(i, 2*N) {
    tr[i].val=tr[i].lazy=-INF;
    tr[i].mi=INF;
  }
  rep(i, n/2) {
    swap(T[i], T[n-i-1]);
    swap(A[i], A[n-i-1]);
    swap(B[i], B[n-i-1]);
  }
  rep(i, q) {
    pyt[i].st=n-pyt[i].st-1;
    pyt[i].nd=n-pyt[i].nd-1;
    swap(pyt[i].st, pyt[i].nd);
  }
  rep(i, n) {
    if(i+A[i]<n) wlacz[i+A[i]].pb(i);
    if(i+B[i]+1<n) wylacz[i+B[i]+1].pb(i);
  }
  rep(i, q) V[pyt[i].nd].pb(i);
  rep(i, n) {
    for(auto j : wlacz[i]) upd(1, 0, N-1, j, T[j]);
    for(auto j : wylacz[i]) upd(1, 0, N-1, j, INF);
    maxuj(1, 0, N-1, i-B[i], i-A[i], T[i]);
    for(auto j : V[i]) wynik[j]=max(wynik[j], cnt(1, 0, N-1, pyt[j].st, pyt[j].nd));
  }
  rep(i, q) cout << wynik[i] << '\n';
}

• Subtask 1: 2 / 2
• Subtask 2: 11 / 11
• Subtask 3: 22 / 22
• Subtask 4: 65 / 65