Submission #735894

#	Time	Username	Problem	Language	Result	Execution time	Memory
735894		math_rabbit_1028	Radio Towers (IOI22_towers)	C++17	0 / 100	672 ms	2120 KiB

towers

#include "towers.h"
#include <bits/stdc++.h>
using namespace std;
 
int n;
vector<int> arr;
vector<int> upidx, downidx;
vector<int> dvalues;
 
void init(int N, vector<int> H) {
  n = N;
  for (int i = 0; i < N; i++) arr.push_back(H[i]);
  
  if (arr[0] < arr[1]) downidx.push_back(0);
  for (int i = 1; i < N - 1; i++) {
    if (arr[i] > arr[i - 1] && arr[i] > arr[i + 1]) upidx.push_back(i);
    if (arr[i] < arr[i - 1] && arr[i] < arr[i + 1]) downidx.push_back(i);
  }
  if (arr[N - 1] < arr[N - 2]) downidx.push_back(N - 1);
  assert(downidx.size() == upidx.size() + 1);
  for (int i = 0; i < upidx.size(); i++) {
    dvalues.push_back(arr[upidx[i]] - max(arr[downidx[i]], arr[downidx[i + 1]]));
  }
  sort(dvalues.begin(), dvalues.end());
}

int max_towers(int L, int R, int D) {
  int ans = dvalues.end() - lower_bound(dvalues.begin(), dvalues.end(), D) + 1;
  return ans;
}

Compilation message (stderr)

towers.cpp: In function 'void init(int, std::vector<int>)':
towers.cpp:21:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |   for (int i = 0; i < upidx.size(); i++) {
      |                   ~~^~~~~~~~~~~~~~

• 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