Submission #1192616

#	Time	Username	Problem	Language	Result	Execution time	Memory
1192616		hyakup	Radio Towers (IOI22_towers)	C++20	14 / 100	256 ms	1956 KiB

towers

#include "towers.h"
#include <bits/stdc++.h>
using namespace std;

const int inf = 2e9;
const int maxn = 1e5 + 10;

vector<int> h, bit( maxn );

void update( int id, int val ){ for( int i = id; i < maxn; i += i&-i ) bit[i] += val; }
int query( int id ){ int sum = 0; for( int i = id; i > 0; i -= i&-i ) sum += bit[i]; return sum; }

void init(int n, vector<int> H) {
  h = H;

  for( int i = 1; i + 1 < n; i++ ) if( h[i] < h[i - 1] && h[i] < h[i + 1] ) update( i, 1 );

}

int max_towers(int l, int r, int d) {
  if( l == r ) return 1;
  int resp = query(r - 1) - query(l);
  if( h[l] < h[l + 1] ) resp++;
  if( h[r] < h[r - 1] ) resp++;

  return resp; 
}

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