oj.uz

Submission #303764

# Submission time Handle Problem Language Result Execution time Memory
303764 2020-09-20T15:47:44 Z user202729 Packing Biscuits (IOI20_biscuits) C++17
12 / 100
 24 ms 896 KB 
// moreflags=grader.cpp
// ...

#include "biscuits.h"
#include<array>
#include<cstdint>
#include<vector>
#include<cmath>
#include<iostream>
#if not LOCAL
#define NDEBUG
#endif
#include<cassert>

struct Node{ // represents a non-strictly decreasing list of numbers
	int64_t count;
	int64_t first;
	int64_t delta;
	std::array<int, 2> children; // index in nodes vector, or {{-1, -1}} if count==1
};
std::vector<Node> nodes;

int deltaed(int node, int64_t delta){
	assert(node>=0);
	if(delta==0) return node;
	nodes.push_back(nodes[node]);
	nodes.back().first+=delta;
	nodes.back().delta+=delta;
	return int(nodes.size()-1);
}

int append(int first, int sec, int64_t delta){
	assert(first>=0); // precondition

	if(sec==-1) return deltaed(first, delta);
	assert(sec>=0);
	nodes.push_back({
		nodes[first].count+nodes[sec].count,
			nodes[first].first+delta,
			delta,
			{{first, sec}}
	});
	return int(nodes.size()-1);
}

int prefixLargerEqual(int node, int64_t minimum){
	// return -1 if result is empty
	assert((nodes[node].count==1)==(nodes[node].children==std::array<int, 2>{{-1, -1}}));

	if(nodes[node].first<minimum) return -1;

	if(nodes[node].count==1){
		// single node
		assert(nodes[node].first==nodes[node].delta);
		return node;
	}

	auto const [a, b]=nodes[node].children;
	auto const t=minimum-nodes[node].delta;
	auto const b1=prefixLargerEqual(b, t);
	if(b1==b) return node;
	if(b1<0) return prefixLargerEqual(a, t);
	return append(a, b1, nodes[node].delta);
}

long long count_tastiness(long long x, std::vector<long long> a) {

	nodes.clear();
	nodes.push_back({1, a[0], a[0], {{-1, -1}}});

	int all=0; // node reference
	// initial list: {a[0]} (note that the first element will always be a[0])

	int64_t s=0;
	for(int i=0;; ++i){
		assert(nodes[all].first==a[0]);
		if(a[0]-x*std::round(std::pow(2., i))>=s){
			all=append(all, deltaed(prefixLargerEqual(all, s+(x<<i)), -(x<<i)), 0);
		}

		if(i+1<(int)a.size())
			s-=a[i+1]<<(i+1);

		if(i==(int)a.size()+62){
			return nodes[all].count;
		}
	}
}

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 256 KB Output is correct
2 Correct 1 ms 256 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 1 ms 256 KB Output is correct
5 Correct 1 ms 256 KB Output is correct
6 Correct 0 ms 256 KB Output is correct
7 Correct 1 ms 256 KB Output is correct
8 Correct 1 ms 256 KB Output is correct
9 Correct 0 ms 256 KB Output is correct
10 Correct 1 ms 256 KB Output is correct
11 Correct 0 ms 256 KB Output is correct
12 Incorrect 1 ms 256 KB Output isn't correct
13 Halted 0 ms 0 KB -

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 256 KB Output is correct
2 Correct 1 ms 256 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 256 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 256 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 256 KB Output is correct

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 384 KB Output is correct
2 Incorrect 24 ms 896 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 256 KB Output is correct
2 Correct 1 ms 256 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 1 ms 256 KB Output is correct
5 Correct 1 ms 256 KB Output is correct
6 Correct 0 ms 256 KB Output is correct
7 Correct 1 ms 256 KB Output is correct
8 Correct 1 ms 256 KB Output is correct
9 Correct 0 ms 256 KB Output is correct
10 Correct 1 ms 256 KB Output is correct
11 Correct 0 ms 256 KB Output is correct
12 Incorrect 1 ms 256 KB Output isn't correct
13 Halted 0 ms 0 KB -