oj.uz

Submission #465314

# Submission time Handle Problem Language Result Execution time Memory
465314 2021-08-15T14:52:10 Z dattranxxx Stove (JOI18_stove) C++11
100 / 100
 141 ms 11044 KB 
/*
 * Author :  shora
 */
#include <bits/stdc++.h>
#define print(_v) for (auto &_ : _v) {cerr << _ << ' ';} cerr << endl;
using namespace std;
using ll = long long;
const int oo = 1e9;
const int N = 1e5;
int n, k;
int a[N+1], spt[N+1][20], log_2[N+1];
int get(int l, int r) {
	int e = log_2[r - l + 1];
	// [0, 10] = [0, 7], [3, 10]
	int x = a[spt[l][e]] - a[spt[l][e] + 1];
	int y = a[spt[r - (1 << e) + 1][e]] - a[spt[r - (1 << e) + 1][e] + 1];
	if (x < y)
		return spt[l][e];
	else
		return spt[r - (1 << e) + 1][e];
}
int h(int l, int r) {
	if (l == r) 
		return oo;
  int m = get(l, r-1);
  int res = a[m] - a[l] + 1 + a[r] - a[m+1] + 1 - (a[r] - a[l] + 1);
	return res; 
}
struct S {
	int l, r;
	S(int l, int r): l(l), r(r) {}
	friend bool operator < (const S& u, const S& v) {
		return h(u.l, u.r) > h(v.l, v.r);
	}
	friend ostream& operator << (ostream& os, const S& s) {
		os << '[' << s.l << ", " << s.r << ']';
	}
};
void build() {
	for (int i = 2; i <= n; ++i)
		log_2[i] = log_2[i / 2] + 1;
	for (int i = 1; i < n; ++i)
		spt[i][0] = i;
	for (int j = 1; j <= log_2[n]; ++j) {
		for (int i = 1; i + (1 << j) - 1 < n; ++i) {
			// [0, 7] = [0, 3] [4, 7]
			int x = a[spt[i][j-1]] - a[spt[i][j-1] + 1];
			int y = a[spt[i + (1 << (j-1))][j-1]] - a[spt[i + (1 << (j-1))][j-1] + 1];
			if (x < y) 
				spt[i][j] = spt[i][j-1];
			else 
				spt[i][j] = spt[i + (1 << (j-1))][j-1];
		}
	}
}
int main() {
  cin.tie(0)->sync_with_stdio(0); cout.tie(0);
  cin >> n >> k;
  for (int i = 1; i <= n; ++i)
  	cin >> a[i];
  build();
  priority_queue<S> q;
  q.push(S(1, n));
  int cur = a[n] - a[1] + 1, res = cur;
  for (int i = 2; i <= k; ++i) {
  	S s = q.top(); q.pop();
  	int l = s.l, r = s.r;
  	res -= a[r] - a[l] + 1;
  	// tim m thuoc [l, r-1] minimize a[m]-a[l]+1 + a[r] - a[m+1]+1
  	// <> minimize a[m]-a[m+1]
  	int m = get(l, r-1);
  	res += a[m] - a[l] + 1;
  	res += a[r] - a[m+1] + 1;
  	q.push(S(l, m));
  	q.push(S(m+1, r));
	}
	cout << res;
  return 0;
}

Compilation message

stove.cpp: In function 'std::ostream& operator<<(std::ostream&, const S&)':
stove.cpp:37:2: warning: no return statement in function returning non-void [-Wreturn-type]
   37 |  }
      |  ^

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 0 ms 332 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 0 ms 332 KB Output is correct
9 Correct 0 ms 204 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 0 ms 332 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 0 ms 332 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 1 ms 588 KB Output is correct
11 Correct 1 ms 588 KB Output is correct
12 Correct 2 ms 588 KB Output is correct
13 Correct 2 ms 588 KB Output is correct
14 Correct 2 ms 588 KB Output is correct
15 Correct 2 ms 588 KB Output is correct

Subtask #3
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 0 ms 332 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 0 ms 332 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 1 ms 588 KB Output is correct
11 Correct 1 ms 588 KB Output is correct
12 Correct 2 ms 588 KB Output is correct
13 Correct 2 ms 588 KB Output is correct
14 Correct 2 ms 588 KB Output is correct
15 Correct 2 ms 588 KB Output is correct
16 Correct 27 ms 9648 KB Output is correct
17 Correct 28 ms 9892 KB Output is correct
18 Correct 31 ms 9888 KB Output is correct
19 Correct 36 ms 10088 KB Output is correct
20 Correct 84 ms 10460 KB Output is correct
21 Correct 141 ms 10948 KB Output is correct
22 Correct 134 ms 10960 KB Output is correct
23 Correct 134 ms 11044 KB Output is correct
24 Correct 119 ms 11036 KB Output is correct