oj.uz

Submission #1082831

# Submission time Handle Problem Language Result Execution time Memory
1082831 2024-09-01T16:52:39 Z Arapak Radio Towers (IOI22_towers) C++17
17 / 100
 809 ms 25264 KB 
// Author: Kajetan Ramsza
#include "bits/stdc++.h"
#include "towers.h"
using namespace std;

#define rep(i,a,b) for(int i=(a);i<(b);++i)
#define all(x) begin(x), end(x)
#define sz(x) (int)x.size()
typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> pii;

#ifdef DEBUG
auto &operator<<(auto &os, const pair<auto, auto> &p) {
	return os<<"("<<p.first<<", "<<p.second<<")";
}
auto &operator<<(auto &os, const auto &v) {
	os << "{";
	for(auto it=begin(v);it!=end(v);it++) {
		if(it != begin(v)) os<<", ";
		os<<(*it);
	}
	return os<<"}";
}

void dbg_out(auto... x) {
	((cerr<<' '<<x), ...) << endl;
}
#define dbg(x...) cerr<<"("<<#x<<"):", dbg_out(x)
#else
#define dbg(...)
#endif

int count_larger(const vi &vec, int x) {
	dbg(vec);
	int b = 0, e = sz(vec);
	while(b < e) {
		int mid = (b+e) / 2;
		if(vec[mid] < x) b = mid + 1;
		else e = mid;
	}
	return sz(vec) - b;
}

struct SegTree {
	int n;
	vector<vi> tree;

	SegTree() {}
	SegTree(vi vals) {
		n = 1;
		while(n < sz(vals))
			n *= 2;
		tree.assign(2*n, {});
		rep(i,0,n)
			if(i < sz(vals))
				tree[n+i] = {vals[i]};
			else
				tree[n+i] = {-1};
		dbg(tree);
		for(int i=n-1;i>0;i--)
			merge(all(tree[2*i]), all(tree[2*i+1]), back_inserter(tree[i]));
		dbg(tree);
	}

	int query(int l, int r, int x) {
		int res = 0;
		for(l+=n, r+=n; l<r; l/=2, r/=2) {
			if(l&1) res += count_larger(tree[l++], x);
			if(r&1) res += count_larger(tree[--r], x);
		}
		return res;
	}
};

const int inf = 2e9 + 7;

int n;
vi h;
vi sel;
vi tim;
vi lft, rht;

SegTree *tree;

void init(int N, vi H) {
	n = N;
	h = H;
	sel.assign(n, 0);
	int prev = -1;
	bool small = false;
	rep(i,0,n) {
		if(small) {
			if(prev != -1 && h[i] <= h[prev]) {
				sel[prev] = false;
				sel[i] = true;
				prev = i;
			}
			else {
				prev = i;
				sel[i] = true;
				small = false;
			}
		} else {
			if(prev != -1 && h[i] >= h[prev]) {
				sel[prev] = false;
				sel[i] = true;
				prev = i;
			}
			else {
				prev = i;
				sel[i] = true;
				small = true;
			}
		}
	}
	dbg(sel);
	set<pii> s;
	tim.assign(n, -1);
	lft.assign(n, -1);
	rht.assign(n, -1);
	prev = -1;
	rep(i,0,n) {
		if(!sel[i])
			continue;
		lft[i] = prev;
		if(prev != -1) rht[prev] = i;
		prev = i;
	}
	auto distance = [&](const int a, const int b) {
		return (int)abs(h[a] - h[b]);
	};
	auto update = [&](const int i) {
		s.erase({tim[i], i});
		tim[i] = inf;
		if(lft[i] != -1) tim[i] = min(tim[i], distance(i, lft[i]));
		if(rht[i] != -1 && rht[rht[i]] != -1) tim[i] = min(tim[i], distance(i, rht[i]));
		s.insert({tim[i], i});
	};
	int parity = 1;
	rep(i,0,n) {
		if(!sel[i])
			continue;
		if(parity) update(i);
		parity ^= 1;
	}
	while(sz(s)) {
		auto [t, i] = *s.begin();
		s.erase(s.begin());
		dbg(t, i);
		if(lft[i] != -1 && t == distance(i, lft[i]) && lft[lft[i]] != -1) {
			rht[lft[lft[i]]] = rht[i];
			update(lft[lft[i]]);
		}
		if(rht[i] != -1 && t == distance(i, rht[i]) && rht[rht[i]] != -1) {
			lft[rht[rht[i]]] = lft[i];
			update(rht[rht[i]]);
		}
		dbg(tim);
	}
	tree = new SegTree(tim);
}

int max_towers(int L, int R, int D) {
	int num = tree->query(0, n, D);
	if(num == 0) return 1;
	dbg(D, num);
	return num;
	// return (num + 1) / 2;
}

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 350 ms 12888 KB 1st lines differ - on the 1st token, expected: '1', found: '2'
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 344 KB 1st lines differ - on the 1st token, expected: '13', found: '131'
2 Halted 0 ms 0 KB -

Subtask #3
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 344 KB 1st lines differ - on the 1st token, expected: '13', found: '131'
2 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Incorrect 549 ms 25164 KB 1st lines differ - on the 1st token, expected: '11903', found: '33010'
2 Halted 0 ms 0 KB -

Subtask #5
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 208 ms 6232 KB Output is correct
2 Correct 737 ms 25164 KB Output is correct
3 Correct 759 ms 25164 KB Output is correct
4 Correct 765 ms 25164 KB Output is correct
5 Correct 793 ms 25228 KB Output is correct
6 Correct 809 ms 25168 KB Output is correct
7 Correct 792 ms 25128 KB Output is correct
8 Correct 708 ms 25164 KB Output is correct
9 Correct 705 ms 25076 KB Output is correct
10 Correct 713 ms 25164 KB Output is correct
11 Correct 692 ms 25164 KB Output is correct
12 Correct 55 ms 25180 KB Output is correct
13 Correct 69 ms 25264 KB Output is correct
14 Correct 69 ms 25168 KB Output is correct
15 Correct 29 ms 25164 KB Output is correct
16 Correct 28 ms 25172 KB Output is correct
17 Correct 55 ms 25164 KB Output is correct
18 Correct 66 ms 25212 KB Output is correct
19 Correct 62 ms 25192 KB Output is correct
20 Correct 70 ms 25164 KB Output is correct
21 Correct 70 ms 25104 KB Output is correct
22 Correct 72 ms 25244 KB Output is correct
23 Correct 74 ms 25172 KB Output is correct
24 Correct 35 ms 25192 KB Output is correct
25 Correct 31 ms 25112 KB Output is correct
26 Correct 36 ms 25164 KB Output is correct
27 Correct 29 ms 25164 KB Output is correct
28 Correct 1 ms 600 KB Output is correct
29 Correct 1 ms 600 KB Output is correct
30 Correct 2 ms 600 KB Output is correct
31 Correct 1 ms 600 KB Output is correct
32 Correct 1 ms 600 KB Output is correct
33 Correct 1 ms 600 KB Output is correct
34 Correct 1 ms 600 KB Output is correct
35 Correct 2 ms 600 KB Output is correct
36 Correct 1 ms 600 KB Output is correct
37 Correct 1 ms 600 KB Output is correct
38 Correct 1 ms 600 KB Output is correct
39 Correct 2 ms 600 KB Output is correct
40 Correct 1 ms 600 KB Output is correct
41 Correct 1 ms 600 KB Output is correct
42 Correct 1 ms 600 KB Output is correct
43 Correct 1 ms 684 KB Output is correct

Subtask #6
0 / 19.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 344 KB 1st lines differ - on the 1st token, expected: '13', found: '131'
2 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 350 ms 12888 KB 1st lines differ - on the 1st token, expected: '1', found: '2'
2 Halted 0 ms 0 KB -