Submission #988058

#	Time	Username	Problem	Language	Result	Execution time	Memory
988058		vjudge1	Feast (NOI19_feast)	C++17	22 / 100	152 ms	8108 KiB

feast

//Code by Patcas Csaba aka SleepyOverlord
#include <vector>
#include <array>
#include <string> 
#include <set> 
#include <map> 
#include <unordered_set>
#include <unordered_map>
#include <queue> 
#include <bitset> 
#include <stack>
#include <list>

#include <numeric> 
#include <algorithm> 
#include <random>
#include <chrono>

#include <cstdio>
#include <fstream>
#include <iostream> 
#include <sstream> 
#include <iomanip>
#include <climits>

#include <cctype>
#include <cmath> 
#include <ctime>
#include <cassert>

using namespace std;

#define ULL unsigned long long
#define LL long long
#define PII pair <int, int>
#define PLL pair <LL, LL>
#define VB vector <bool>
#define VI vector <int>
#define VLL vector <LL>
#define VD vector <double>
#define VS vector <string>
#define VPII vector <pair <int, int> >
#define VVI vector < VI >
#define VVLL vector < VLL >
#define VVB vector < VB >
#define SI set < int >
#define USI unordered_set <int>
#define MII map <int, int>
#define UMII unordered_map <int, int>

#define FORN(i, n) for(int i = 0; i < (n); ++i)
#define FOR(i, a, b) for(int i = (a); i <= (b); ++i)
#define FORD(i, a, b) for(int i = (a); i >= (b); --i)
#define MX(x, y) x = max(x, y)
#define MN(x, y) x = min(x, y)

#define SZ size()
#define BG begin() 
#define EN end() 
#define CL clear()
#define X first
#define Y second
#define RS resize
#define PB push_back
#define MP make_pair
#define ALL(x) x.begin(), x.end()
#define INS insert
#define ER erase
#define CNT count

template <class T> ostream& operator <<(ostream & os, const vector<T> &vec)
{
	for (int i = 0; i < vec.size() - 1; ++i) os << vec[i] << ' ';
	return os << vec[vec.size() - 1];
}

template <class T1, class T2> ostream& operator <<(ostream & os, const pair<T1, T2> &p)
{
	return os << p.X << " " << p.Y;
}

template <typename T>
void pr(T var1)
{
	cout << var1 << '\n';
}
template <typename T, typename... Types>
void pr(T var1, Types... var2)
{
	cout << var1;
	pr(var2...);
}

void in(int &n, VI &a) //array of ints
{
	cin >> n;
	a.CL, a.RS(n + 1);
	FOR(i, 1, n) cin >> a[i];
}

void in(int &n, VS &a) //array of strings
{
	cin >> n;
	a.CL, a.RS(n + 1);
	FOR(i, 1, n) cin >> a[i];
}

void in(int &n, VPII &a) //array of pairs
{
	cin >> n;
	a.CL, a.RS(n + 1);
	FOR(i, 1, n) cin >> a[i].X >> a[i].Y;
}

void in(int &n, int &m, VVI &g) //unweighted graph
{
	cin >> n >> m;
	g.CL, g.RS(n + 1);
	FOR(i, 1, n)
	{
		int x, y;
		cin >> x >> y;
		g[x].PB(y);
		g[y].PB(x);
	}
}

void in(int &n, VVI &g) //unweighted tree
{
	cin >> n;
	g.CL, g.RS(n + 1);
	FOR(i, 1, n - 1)
	{
		int x, y;
		cin >> x >> y;
		g[x].PB(y);
		g[y].PB(x);
	}
}

void in(int &n, int &m, vector <VPII> &g) //weighted graph
{
	cin >> n >> m;
	g.CL, g.RS(n + 1);
	FOR(i, 1, n)
	{
		int x, y, z;
		cin >> x >> y >> z;
		g[x].PB({y, z});
		g[y].PB({x, z});
	}
}

void in(int &n, vector <VPII> &g) //weighted tree
{
	cin >> n;
	g.CL, g.RS(n + 1);
	FOR(i, 1, n - 1)
	{
		int x, y, z;
		cin >> x >> y >> z;
		g[x].PB({y, z});
		g[y].PB({x, z});
	}
}

int n, k;
VI a;

pair <LL, int> solve(LL lambda)
{
	VLL dp(n + 1);
	VI ppl(n + 1);
	LL sum = 0;
	int prev = 0;
	FOR(i, 1, n)
	{
		sum += a[i];
		if (sum < 0) sum = 0, prev = i;
		dp[i] = dp[i - 1], ppl[i] = ppl[i - 1];
		if (dp[i] < dp[prev] + sum - lambda)
		{
			dp[i] = dp[prev] + sum - lambda;
			ppl[i] = ppl[prev] + 1;
		}
	}
	return {dp[n], ppl[n]};
}

int main()
{
	#ifdef AT_HOME
	freopen("a.in", "r", stdin);
	freopen("a.out", "w", stdout);
	#endif

	cin >> n >> k;
	a.RS(n + 1);
	FOR(i, 1, n) cin >> a[i];

	LL l = 0, r = 1e18;
	while (r - l > 1)
	{
		LL m = (r + l) / 2;
		auto aux = solve(m);
		if (aux.Y > k) l = m;
		else r = m;
	}
	auto aux = solve(r);
	pr(aux.X + aux.Y * r);

	return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 0 / 8
• Subtask 3: 18 / 18
• Subtask 4: 0 / 10
• Subtask 5: 0 / 11
• Subtask 6: 0 / 20
• Subtask 7: 0 / 29