Submission #1056648

#	Time	Username	Problem	Language	Result	Execution time	Memory
1056648		mychecksedad	Radio Towers (IOI22_towers)	C++17	0 / 100	359 ms	2516 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){
  if(a.size() <= 1){
    A = a;
    B.pb(0);
    return;
  }
  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, a;
void init(int nn, std::vector<int> aa) { n=nn;a=aa;
  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);
  int add = (A[L] > A[L+1] && l<L && a[l] < A[L]) + (r>R && a[r] < A[R] && A[R] > A[R - 1]);
  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:24:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |   for(int i = 2; i < a.size(); ++i){
      |                  ~~^~~~~~~~~~
towers.cpp: In function 'void init(int, std::vector<int>)':
towers.cpp:48:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |   for(int i = 0; i < A.size(); i += 2){
      |                  ~~^~~~~~~~~~
towers.cpp:51:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |   for(int i = 1; i < A.size(); i += 2){
      |                  ~~^~~~~~~~~~
towers.cpp: In function 'int max_towers(int, int, int)':
towers.cpp:66:7: warning: unused variable 'add' [-Wunused-variable]
   66 |   int add = (A[L] > A[L+1] && l<L && a[l] < A[L]) + (r>R && a[r] < A[R] && A[R] > A[R - 1]);
      |       ^~~

• 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