oj.uz

Submission #1079466

# Submission time Handle Problem Language Result Execution time Memory
1079466 2024-08-28T15:14:02 Z LittleOrange Radio Towers (IOI22_towers) C++17
14 / 100
 694 ms 1956 KB 
#include "towers.h"

#include <vector>
#include<bits/stdc++.h>
using namespace std;
using ll = int;
const ll big = 1e9+10;
ll n;
vector<ll> h;
//ll mx;
vector<ll> ps;
struct obj{
  ll v,c;
  bool operator<(const obj &o) const{
    return v<o.v;
  }
  bool operator>(const obj &o) const{
    return v>o.v;
  }
};

void init(int N, std::vector<int> H) {
  n = N;
  h = H;
  //for(ll i = 0;i<n;i++) if((i==0||(h[i-1]<h[i]))&&(i==n-1||h[i]>h[i+1])) mx = i;
  for(ll i = 1;i<n-1;i++){
    if (h[i-1]<h[i]&&h[i]>h[i+1]){
      ps.push_back(i);
    }
  }
  //for(auto [u,v] : ps) cerr << "[" << u << "," << v << "]" << " ";cerr << "\n";
}

int max_towers(int L, int R, int D) {
  ll l = L, r = R, d = D;
  ll ans = 1;
  auto it0 = lower_bound(ps.begin(),ps.end(),r);
  ll rf = it0-ps.begin();
  auto it1 = lower_bound(ps.begin(),ps.end(),l+1);
  ll lf = it1-ps.begin();
  //cerr << lf << " " << rf << "\n";
  return max(0,rf-lf)+1;
  /*vector<obj> a,b;
  a.push_back({0,0});
  b.push_back({big,0});
  for(ll i = l;i<=r;i++){
    ll cur = 0;
    auto it = lower_bound(b.begin(),b.end(),obj({h[i]-1,0}),greater<obj>());
    --it;
    cur = (*it).c;
    ans = max(ans,cur+1);
    obj oa = {h[i],cur+1};
    if (a.size()<=oa.c) a.push_back(oa);
    else a[oa.c] = min(a[oa.c],oa);
    auto it0 = lower_bound(a.begin(),a.end(),obj({h[i]-d+1,0}));
    --it0;
    obj ob = {h[i]-d,(*it0).c};
    if (b.size()<=ob.c) b.push_back(ob);
    else b[ob.c] = max(b[ob.c],ob);
    ans = max(ans,cur+1);
    //cerr << "a:";for(auto [u,v] : a) cerr << "(" << u <<"," << v << ") ";cerr << "\n";
    //cerr << "b:";for(auto [u,v] : b) cerr << "(" << u <<"," << v << ") ";cerr << "\n";
  }*/
  return ans;
}

Compilation message

towers.cpp: In function 'int max_towers(int, int, int)':
towers.cpp:35:20: warning: unused variable 'd' [-Wunused-variable]
   35 |   ll l = L, r = R, d = D;
      |                    ^

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 308 ms 1112 KB 2nd lines differ - on the 1st token, expected: '1', found: '2'
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB 1st lines differ - on the 1st token, expected: '13', found: '16'
2 Halted 0 ms 0 KB -

Subtask #3
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB 1st lines differ - on the 1st token, expected: '13', found: '16'
2 Halted 0 ms 0 KB -

Subtask #4
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 525 ms 1852 KB Output is correct
2 Correct 675 ms 1880 KB Output is correct
3 Correct 652 ms 1880 KB Output is correct
4 Correct 682 ms 1880 KB Output is correct
5 Correct 694 ms 1880 KB Output is correct
6 Correct 647 ms 1880 KB Output is correct
7 Correct 652 ms 1880 KB Output is correct
8 Correct 647 ms 1600 KB Output is correct
9 Correct 659 ms 1600 KB Output is correct
10 Correct 627 ms 1368 KB Output is correct
11 Correct 659 ms 1368 KB Output is correct
12 Correct 599 ms 1624 KB Output is correct
13 Correct 643 ms 1368 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 344 KB Output is correct
17 Correct 9 ms 1956 KB Output is correct
18 Correct 11 ms 1880 KB Output is correct
19 Correct 9 ms 1880 KB Output is correct
20 Correct 8 ms 1600 KB Output is correct
21 Correct 8 ms 1368 KB Output is correct
22 Correct 10 ms 1880 KB Output is correct
23 Correct 9 ms 1880 KB Output is correct
24 Correct 10 ms 1956 KB Output is correct
25 Correct 8 ms 1368 KB Output is correct
26 Correct 8 ms 1600 KB Output is correct
27 Correct 1 ms 344 KB Output is correct
28 Correct 1 ms 344 KB Output is correct
29 Correct 1 ms 344 KB Output is correct
30 Correct 1 ms 344 KB Output is correct
31 Correct 0 ms 344 KB Output is correct
32 Correct 1 ms 344 KB Output is correct
33 Correct 0 ms 344 KB Output is correct
34 Correct 0 ms 344 KB Output is correct
35 Correct 0 ms 344 KB Output is correct
36 Correct 0 ms 344 KB Output is correct

Subtask #5
0 / 17.0

# Verdict Execution time Memory Grader output
1 Incorrect 189 ms 600 KB 1st lines differ - on the 1st token, expected: '7197', found: '8004'
2 Halted 0 ms 0 KB -

Subtask #6
0 / 19.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB 1st lines differ - on the 1st token, expected: '13', found: '16'
2 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 308 ms 1112 KB 2nd lines differ - on the 1st token, expected: '1', found: '2'
2 Halted 0 ms 0 KB -