oj.uz

Submission #1036300

# Submission time Handle Problem Language Result Execution time Memory
1036300 2024-07-27T08:26:29 Z aymanrs Radio Towers (IOI22_towers) C++17
4 / 100
 701 ms 24524 KB 
#include "towers.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> pr, h;
const int K = 17;
vector<pair<int, int>> sp[K];
vector<int> spm[K];
vector<int> ds;
inline int msb(int x){
    return 31-__builtin_clz(x);
}
int que(int l, int r){
  int d = msb(r-l+1);
  return max(sp[d][l], sp[d][r-(1<<d)+1]).second;
}
int qum(int l, int r){
  int d = msb(r-l+1);
  return min(spm[d][l], spm[d][r-(1<<d)+1]);
}
bool sub1 = true;
int th;
void init(int N, std::vector<int> H) {
  h = H;
  pr.resize(N);
  pr[0]=0;
  auto mx = max_element(h.begin(), h.end());
  if(is_sorted(h.begin(), mx) && is_sorted(mx, h.end(), greater<int>())) {
    sub1=true;
    th = mx-h.begin();
  }
  else sub1=false;
  int l[N], r[N], p[N];
  for(int i = 0;i < K;i++) {
    sp[i].resize(N);
    spm[i].resize(N);
  }
  for(int i = 0;i < N;i++){
    l[i]=i;
    while(l[i]&&H[l[i]-1]<H[i]) l[i]=l[l[i]-1];
    sp[0][i] = {H[i], i};spm[0][i]=H[i];
  }
  for(int i = N-1;i >= 0;i--){
    r[i]=i;
    while(r[i]<N-1&&H[r[i]+1]<H[i]) r[i]=r[r[i]+1];
    if(i==th) continue;
    if(!l[i] || (r[i]<N-1&&H[l[i]-1]>H[r[i]+1])){
      p[i] = r[i]+1;
    } else {
      p[i]=l[i]-1;
    }
  }
  vector<pair<int, int>> D;
  bool mark[N] = {false};
  mark[th] = true;
  for(int i = 0;i < N;i++){
    if(i==th) continue;
    D.push_back({H[p[i]]-qum(l[i], r[i]), i});
  }
  sort(D.begin(), D.end(), greater<pair<int, int>>());
  for(auto [d, i] : D){
    mark[i] = true;
    if(mark[p[i]]) {
      mark[p[i]] = false;
    } else ds.push_back(d);
  }
  for(int k = 1;k < K;k++){
    for(int i = 0;i+(1<<k)<=N;i++){
      sp[k][i] = max(sp[k-1][i], sp[k-1][i+(1<<k-1)]);
      spm[k][i] = min(spm[k-1][i], spm[k-1][i+(1<<k-1)]);
    }
  }
  for(int i = 1;i < N-1;i++){
    pr[i]=pr[i-1];
    if(H[i] < H[i-1] && H[i] < H[i+1]) pr[i]++;
  }
}
int de;
int ans(int l, int r, int atm){
  if(l==r){
    if(h[l]<=atm) return 1;
    return 0;
  }
  int m = que(l, r);
  if(l==m) return ans(l+1, r, atm);
  if(m==r) return ans(l, r-1, atm);
  return max(ans(l, m-1, h[m]-de)+ans(m+1, r, h[m]-de), (qum(l,r) <= atm ? 1 : 0));
}
int max_towers(int L, int R, int D) {
  if(!L && R == h.size()-1){
    return 1+lower_bound(ds.begin(), ds.end(), D-1, greater<int>())-ds.begin();
  }
  if(sub1){
    if(L>th || R < th) return 1;
    return (h[R] <= h[th]-D && h[L] <= h[th]-D ? 2 : 1);
  }
  de = D;
  if(L+1>=R) return 1;
  if(D==1) return pr[R-1]-pr[L]+(h[L] < h[L+1])+(h[R]<h[R-1]);
  return ans(L, R, INT_MAX);
}

Compilation message

towers.cpp: In function 'void init(int, std::vector<int>)':
towers.cpp:68:49: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   68 |       sp[k][i] = max(sp[k-1][i], sp[k-1][i+(1<<k-1)]);
      |                                                ~^~
towers.cpp:69:52: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   69 |       spm[k][i] = min(spm[k-1][i], spm[k-1][i+(1<<k-1)]);
      |                                                   ~^~
towers.cpp: In function 'int max_towers(int, int, int)':
towers.cpp:89:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   89 |   if(!L && R == h.size()-1){
      |            ~~^~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 283 ms 14548 KB Output is correct
2 Correct 645 ms 24240 KB Output is correct
3 Correct 621 ms 24248 KB Output is correct
4 Correct 609 ms 24272 KB Output is correct
5 Correct 593 ms 24272 KB Output is correct
6 Correct 598 ms 24272 KB Output is correct
7 Correct 660 ms 24272 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 1 ms 856 KB Output is correct
10 Correct 0 ms 856 KB Output is correct

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 856 KB Output is correct
3 Correct 1 ms 880 KB Output is correct
4 Correct 1 ms 856 KB Output is correct
5 Correct 1 ms 856 KB Output is correct
6 Correct 1 ms 856 KB Output is correct
7 Correct 1 ms 856 KB Output is correct
8 Correct 1 ms 856 KB Output is correct
9 Correct 1 ms 856 KB Output is correct
10 Correct 1 ms 856 KB Output is correct
11 Correct 1 ms 856 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 1 ms 856 KB Output is correct
14 Correct 1 ms 856 KB Output is correct
15 Correct 1 ms 856 KB Output is correct
16 Correct 1 ms 856 KB Output is correct
17 Correct 1 ms 1108 KB Output is correct
18 Correct 1 ms 856 KB Output is correct
19 Correct 1 ms 856 KB Output is correct
20 Correct 1 ms 856 KB Output is correct
21 Correct 1 ms 856 KB Output is correct
22 Correct 1 ms 856 KB Output is correct
23 Correct 1 ms 856 KB Output is correct
24 Incorrect 1 ms 856 KB 1st lines differ - on the 1st token, expected: '5', found: '6'
25 Halted 0 ms 0 KB -

Subtask #3
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 856 KB Output is correct
3 Correct 1 ms 880 KB Output is correct
4 Correct 1 ms 856 KB Output is correct
5 Correct 1 ms 856 KB Output is correct
6 Correct 1 ms 856 KB Output is correct
7 Correct 1 ms 856 KB Output is correct
8 Correct 1 ms 856 KB Output is correct
9 Correct 1 ms 856 KB Output is correct
10 Correct 1 ms 856 KB Output is correct
11 Correct 1 ms 856 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 1 ms 856 KB Output is correct
14 Correct 1 ms 856 KB Output is correct
15 Correct 1 ms 856 KB Output is correct
16 Correct 1 ms 856 KB Output is correct
17 Correct 1 ms 1108 KB Output is correct
18 Correct 1 ms 856 KB Output is correct
19 Correct 1 ms 856 KB Output is correct
20 Correct 1 ms 856 KB Output is correct
21 Correct 1 ms 856 KB Output is correct
22 Correct 1 ms 856 KB Output is correct
23 Correct 1 ms 856 KB Output is correct
24 Incorrect 1 ms 856 KB 1st lines differ - on the 1st token, expected: '5', found: '6'
25 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 444 ms 24016 KB Output is correct
2 Correct 580 ms 24264 KB Output is correct
3 Correct 580 ms 24232 KB Output is correct
4 Correct 557 ms 24516 KB Output is correct
5 Correct 579 ms 24516 KB Output is correct
6 Correct 701 ms 24524 KB Output is correct
7 Correct 617 ms 24524 KB Output is correct
8 Correct 641 ms 24272 KB Output is correct
9 Correct 588 ms 24272 KB Output is correct
10 Correct 624 ms 24272 KB Output is correct
11 Correct 660 ms 24272 KB Output is correct
12 Correct 573 ms 24272 KB Output is correct
13 Correct 636 ms 24272 KB Output is correct
14 Correct 0 ms 344 KB Output is correct
15 Correct 1 ms 856 KB Output is correct
16 Correct 1 ms 856 KB Output is correct
17 Correct 30 ms 24460 KB Output is correct
18 Correct 29 ms 24524 KB Output is correct
19 Correct 37 ms 24524 KB Output is correct
20 Correct 22 ms 24272 KB Output is correct
21 Correct 27 ms 24272 KB Output is correct
22 Correct 31 ms 24272 KB Output is correct
23 Correct 29 ms 24516 KB Output is correct
24 Correct 30 ms 24472 KB Output is correct
25 Correct 22 ms 24272 KB Output is correct
26 Incorrect 35 ms 24236 KB 1st lines differ - on the 1st token, expected: '5', found: '6'
27 Halted 0 ms 0 KB -

Subtask #5
0 / 17.0

# Verdict Execution time Memory Grader output
1 Incorrect 167 ms 6232 KB 1st lines differ - on the 1st token, expected: '7197', found: '7276'
2 Halted 0 ms 0 KB -

Subtask #6
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 856 KB Output is correct
3 Correct 1 ms 880 KB Output is correct
4 Correct 1 ms 856 KB Output is correct
5 Correct 1 ms 856 KB Output is correct
6 Correct 1 ms 856 KB Output is correct
7 Correct 1 ms 856 KB Output is correct
8 Correct 1 ms 856 KB Output is correct
9 Correct 1 ms 856 KB Output is correct
10 Correct 1 ms 856 KB Output is correct
11 Correct 1 ms 856 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 1 ms 856 KB Output is correct
14 Correct 1 ms 856 KB Output is correct
15 Correct 1 ms 856 KB Output is correct
16 Correct 1 ms 856 KB Output is correct
17 Correct 1 ms 1108 KB Output is correct
18 Correct 1 ms 856 KB Output is correct
19 Correct 1 ms 856 KB Output is correct
20 Correct 1 ms 856 KB Output is correct
21 Correct 1 ms 856 KB Output is correct
22 Correct 1 ms 856 KB Output is correct
23 Correct 1 ms 856 KB Output is correct
24 Incorrect 1 ms 856 KB 1st lines differ - on the 1st token, expected: '5', found: '6'
25 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 283 ms 14548 KB Output is correct
2 Correct 645 ms 24240 KB Output is correct
3 Correct 621 ms 24248 KB Output is correct
4 Correct 609 ms 24272 KB Output is correct
5 Correct 593 ms 24272 KB Output is correct
6 Correct 598 ms 24272 KB Output is correct
7 Correct 660 ms 24272 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 1 ms 856 KB Output is correct
10 Correct 0 ms 856 KB Output is correct
11 Correct 1 ms 344 KB Output is correct
12 Correct 1 ms 856 KB Output is correct
13 Correct 1 ms 880 KB Output is correct
14 Correct 1 ms 856 KB Output is correct
15 Correct 1 ms 856 KB Output is correct
16 Correct 1 ms 856 KB Output is correct
17 Correct 1 ms 856 KB Output is correct
18 Correct 1 ms 856 KB Output is correct
19 Correct 1 ms 856 KB Output is correct
20 Correct 1 ms 856 KB Output is correct
21 Correct 1 ms 856 KB Output is correct
22 Correct 0 ms 344 KB Output is correct
23 Correct 1 ms 856 KB Output is correct
24 Correct 1 ms 856 KB Output is correct
25 Correct 1 ms 856 KB Output is correct
26 Correct 1 ms 856 KB Output is correct
27 Correct 1 ms 1108 KB Output is correct
28 Correct 1 ms 856 KB Output is correct
29 Correct 1 ms 856 KB Output is correct
30 Correct 1 ms 856 KB Output is correct
31 Correct 1 ms 856 KB Output is correct
32 Correct 1 ms 856 KB Output is correct
33 Correct 1 ms 856 KB Output is correct
34 Incorrect 1 ms 856 KB 1st lines differ - on the 1st token, expected: '5', found: '6'
35 Halted 0 ms 0 KB -