Submission #981979

#	Time	Username	Problem	Language	Result	Execution time	Memory
981979		nnin	Sequence (APIO23_sequence)	C++17	31 / 100	715 ms	74832 KiB

sequence

#include "sequence.h"
#include<bits/stdc++.h>
using namespace std;
#define pii pair<int,int>
#define f first
#define s second

vector<int> ct[500005];
int N;

struct segTree {
  pii seg[4*500005];
  int lazy[4*500005];

  void laze(int i, int l, int r) {
    seg[i].f += lazy[i];
    seg[i].s += lazy[i];
    if(l!=r) {
      lazy[i*2+1] += lazy[i];
      lazy[i*2+2] += lazy[i];
    }
    lazy[i] = 0;
  }

  void build(int i, int l, int r) {
    lazy[i] = 0;
    if(l==r) {
      seg[i].f = seg[i].s = l;
      return;
    }
    int m = (l+r)/2;
    build(i*2+1, l, m);
    build(i*2+2, m+1, r);
    seg[i].f = min(seg[i*2+1].f, seg[i*2+2].f);
    seg[i].s = max(seg[i*2+1].s, seg[i*2+2].s);
  }
  void build() {
    build(0, 0, N);
  }

  void update(int i, int l, int r, int wl, int wr, int val) {
    if(wl<=l && wr>=r) lazy[i] += val;
    laze(i, l, r);
    if(wl>r || wr<l || (wl<=l && wr>=r)) return;
    int m = (l+r)/2;
    update(i*2+1, l, m, wl, wr, val);
    update(i*2+2, m+1, r, wl, wr, val);
    seg[i].f = min(seg[i*2+1].f, seg[i*2+2].f);
    seg[i].s = max(seg[i*2+1].s, seg[i*2+2].s);
  }
  void update(int wl, int wr, int val) {
    update(0, 0, N, wl, wr, val);
  }

  pii query(int i, int l, int r, int wl, int wr) {
    laze(i, l, r);
    if(wl>r || wr<l || wl>wr) return {(int)1e9, (int)-1e9};
    if(wl<=l && wr>=r) return seg[i];
    int m = (l+r)/2;
    pii q1 = query(i*2+1, l, m, wl, wr);
    pii q2 = query(i*2+2, m+1, r, wl, wr);
    return {min(q1.f, q2.f), max(q1.s, q2.s)};
  }
  pii query(int wl, int wr) {
    return query(0, 0, N, wl, wr);
  }
} les, mor;

int sequence(int n, std::vector<int> A) {
  N = n;
  for(int i=0;i<N;i++) {
    ct[A[i]].push_back(i+1);
  }
  les.build();
  mor.build();
  int ans = 1;
  for(int i=1;i<=N;i++) {
    for(int j:ct[i]) {
      les.update(j, N, -2);
    }
    for(int j:ct[i-1]) {
      mor.update(j, N, -2);
    }
    for(int j=0;j+ans<ct[i].size();j++) {
      while(j+ans<ct[i].size()) {  
        int st = ct[i][j];
        int en = ct[i][j+ans];
        int qles = les.query(en, N).f - les.query(0, st-1).s;
        int qmor = mor.query(en, N).s - les.query(0, st-1).f;
        if(qles<=0 && qmor>=0) ans++;
        else break;
      }
    }
  }
  return ans;
}

Compilation message (stderr)

sequence.cpp: In function 'int sequence(int, std::vector<int>)':
sequence.cpp:84:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   84 |     for(int j=0;j+ans<ct[i].size();j++) {
      |                 ~~~~~^~~~~~~~~~~~~
sequence.cpp:85:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   85 |       while(j+ans<ct[i].size()) {
      |             ~~~~~^~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 0 / 17
• Subtask 3: 7 / 7
• Subtask 4: 0 / 12
• Subtask 5: 13 / 13
• Subtask 6: 0 / 22
• Subtask 7: 0 / 18