Submission #1056616

#	Time	Username	Problem	Language	Result	Execution time	Memory
1056616		mychecksedad	Radio Towers (IOI22_towers)	C++17	0 / 100	400 ms	2508 KiB

towers

#include "towers.h"
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define all(x) x.begin(),x.end()
#define ll long long int
#define en cout << '\n'
#define pi pair<int,int>
#define vi vector<int> 
#define ff first
#define ss second


void op(vector<int> &a, vector<int> &A, vector<int> &B){
  A.pb(a[0]);
  A.pb(a[1]);
  B.pb(0);
  B.pb(1);
  for(int i = 2; i < a.size(); ++i){
    if(a[i] > A.back() && A.back() > A[int(A.size()) - 2]){
      A.pop_back();
      B.pop_back();
      A.pb(a[i]);
      B.pb(i);
    }else if(a[i] < A.back() && A.back() < A[int(A.size()) - 2]){
      A.pop_back();
      B.pop_back();
      A.pb(a[i]);
      B.pb(i);
    }else{
      A.pb(a[i]);
      B.pb(i);
    }
  }
  
}
int n;
vector<int> A, B, A2, A1, B1, B2;
void init(int nn, std::vector<int> a) { n=nn;
  if(n == 1) return;
  op(a, A, B);
  vector<int> x, y;
  for(int i = 0; i < A.size(); i += 2){
    x.pb(A[i]);
  }
  for(int i = 1; i < A.size(); i += 2){
    y.pb(A[i]);
  }
  op(y, A2, B2);
  op(x, A1, B1);
}

int max_towers(int L, int R, int D) {
  if(n == 1) return 1;
  int l = L, r = R;
  L = lower_bound(all(B), L) - B.begin();
  R = upper_bound(all(B), R) - B.begin(); --R;
  // cout << "f";
  if(R < L) return min(r-l+1, 2);
  if(L == R) return min(r-l+1, 2);
  if(A[L] > A[L + 1]){
    if(L%2==0){
      int Lx = lower_bound(all(B1), L) - B1.begin();
      int Rx = upper_bound(all(B1), R) - B1.begin(); --Rx;
      if((Rx-Lx+1)/2 > max(min(2,r-l+1),(R-L+1)/2)) return (Rx-Lx+1)/2;
    }
    if(L%2==1){
      int Lx = lower_bound(all(B2), L) - B2.begin();
      int Rx = upper_bound(all( B2), R) - B2.begin(); --Rx;
      if((Rx-Lx+1)/2 > max(min(2,r-l+1),(R-L+1)/2)) return (Rx-Lx+1)/2;
    }
    return max(min(2,r-l+1),(R-L+1)/2);
  }
  return max(min(2,r-l+1), (R-L+2)/2);
}

Compilation message (stderr)

towers.cpp: In function 'void op(std::vector<int>&, std::vector<int>&, std::vector<int>&)':
towers.cpp:19:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |   for(int i = 2; i < a.size(); ++i){
      |                  ~~^~~~~~~~~~
towers.cpp: In function 'void init(int, std::vector<int>)':
towers.cpp:43:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |   for(int i = 0; i < A.size(); i += 2){
      |                  ~~^~~~~~~~~~
towers.cpp:46:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |   for(int i = 1; i < A.size(); i += 2){
      |                  ~~^~~~~~~~~~

• Subtask 1: 0 / 4
• Subtask 2: 0 / 11
• Subtask 3: 0 / 12
• Subtask 4: 0 / 14
• Subtask 5: 0 / 17
• Subtask 6: 0 / 19
• Subtask 7: 0 / 23