Submission #151790

#	Time	Username	Problem	Language	Result	Execution time	Memory
151790		qkxwsm	Teams (IOI15_teams)	C++14	77 / 100	4099 ms	372812 KiB

teams

#include "teams.h"
#include <bits/stdc++.h>

using namespace std;

template<class T>
void readi(T &x)
{
	T input = 0;
	bool negative = false;
	char c = ' ';
	while (c < '-')
	{
		c = getchar();
	}
	if (c == '-')
	{
		negative = true;
		c = getchar();
	}
	while (c >= '0')
	{
		input = input * 10 + (c - '0');
		c = getchar();
	}
	if (negative)
	{
		input = -input;
	}
	x = input;
}
template<class T>
void printi(T output)
{
	if (output == 0)
	{
		putchar('0');
		return;
	}
	if (output < 0)
	{
		putchar('-');
		output = -output;
	}
	int aout[20];
	int ilen = 0;
	while(output)
	{
		aout[ilen] = ((output % 10));
		output /= 10;
		ilen++;
	}
	for (int i = ilen - 1; i >= 0; i--)
	{
		putchar(aout[i] + '0');
	}
	return;
}
template<class T>
void ckmin(T &a, T b)
{
	a = min(a, b);
}
template<class T>
void ckmax(T &a, T b)
{
	a = max(a, b);
}
long long randomize(long long mod)
{
	return ((1ll << 30) * rand() + (1ll << 15) * rand() + rand()) % mod;
}

#define MP make_pair
#define PB push_back
#define PF push_front
#define LB lower_bound
#define UB upper_bound
#define fi first
#define se second

const long double PI = 4.0 * atan(1.0);
const long double EPS = 1e-20;

#define MAGIC 347
#define SINF 10007
#define CO 1000007
#define INF 1000000007
#define BIG 1000000931
#define LARGE 1696969696967ll
#define GIANT 2564008813937411ll
#define LLINF 2696969696969696969ll
#define MAXN 500013

long long normalize(long long x, long long mod = INF)
{
	return (((x % mod) + mod) % mod);
}

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

int N, M, K, T;
pii want[MAXN];
pii arr[MAXN];
int dp[MAXN];

struct node
{
	node *ch[2];
	int sum;
	node()
	{
		ch[0] = ch[1] = nullptr;
		sum = 0;
	}
};
node *root[MAXN];
int ft[MAXN];

node* initpseg(int L, int R)
{
	node *t = new node();
	if (L == R)
	{
		return t;
	}
	int mid = (L + R) / 2;
	t -> ch[0] = initpseg(L, mid);
	t -> ch[1] = initpseg(mid + 1, R);
	return t;
}
node* update(node *w, int L, int R, int x, int v)
{
	if (x < L || R < x)
	{
		return w;
	}
	node *t = new node();
	if (L == R)
	{
		t -> sum = w -> sum + v;
		t -> ch[0] = t -> ch[1] = nullptr;
		return t;
	}
	int mid = (L + R) / 2;
	t -> ch[0] = update(w -> ch[0], L, mid, x, v);
	t -> ch[1] = update(w -> ch[1], mid + 1, R, x, v);
	t -> sum = t -> ch[0] -> sum + t -> ch[1] -> sum;
	return t;
}
int query(node *t, int L, int R, int a, int b)
{
	if (b < L || R < a)
	{
		return 0;
	}
	if (a <= L && R <= b)
	{
		return t -> sum;
	}
	int mid = (L + R) / 2;
	return query(t -> ch[0], L, mid, a, b) + query(t -> ch[1], mid + 1, R, a, b);
}
int rect(int X1, int X2, int Y1, int Y2)
{
	return query(root[ft[X2]], 0, N, Y1, Y2) - query(root[ft[X1 - 1]], 0, N, Y1, Y2);
}
int cost(int L, int R)
{
	return (rect(arr[L].fi + 1, arr[R].fi, arr[R].fi, N));
}
int overpass(int a, int b)
{
	//when does a become a better choice then b
	int lo = b + 1, hi = K;
	while(hi > lo)
	{
		int mid = (hi + lo) / 2;
		if (dp[a] + cost(a, mid) <= dp[b] + cost(b, mid))
		{
			//a is better than b
			hi = mid;
		}
		else
		{
			lo = mid + 1;
		}
	}
	return lo;
}
void init(int n, int A[], int B[])
{
	N = n;
	for (int i = 0; i < N; i++)
	{
		want[i] = MP(A[i], B[i]);
	}
	sort(want, want + N);
	root[0] = initpseg(0, N);
	T = 1;
	for (int i = 0; i < N; i++)
	{
		if (i)
		{
			for (int j = want[i - 1].fi; j < want[i].fi; j++)
			{
				ft[j] = T - 1;
			}
		}
		else
		{
			for (int j = 0; j < want[i].fi; j++)
			{
				ft[j] = T - 1;
			}
		}
		ft[want[i].fi] = T;
		root[T] = update(root[T - 1], 0, N, want[i].se, 1);
		T++;
	}
	for (int j = want[N - 1].fi; j <= N; j++)
	{
		ft[j] = T - 1;
	}
}
int can(int m, int a[])
{
	M = m;
	int s = 0;
	for (int i = 0; i < M; i++)
	{
		s += a[i];
	}
	if (s > N)
	{
		return 0;
	}
	sort(a, a + M);
	K = 1;
	arr[0] = {0, 0};
	for (int i = 0; i < M; i++)
	{
		if (i == 0 || a[i] != a[i - 1])
		{
			arr[K] = MP(a[i], 1);
			K++;
		}
		else
		{
			arr[K - 1].se++;
		}
	}
	deque<int> opt;
	opt.PB(0);
	for (int i = 1; i < K; i++)
	{
		int sz = arr[i].fi;
		dp[i] = INF;
		while(opt.size() >= 2 && overpass(opt[opt.size() - 2], opt[opt.size() - 1]) <= i)
		{
			opt.pop_back();
		}
		int j = opt.back();
		ckmin(dp[i], dp[j] + cost(j, i));
		dp[i] -= arr[i].fi * arr[i].se;
		while(opt.size() >= 2 && overpass(opt[opt.size() - 2], opt[opt.size() - 1]) <= overpass(opt[opt.size() - 1], i))
		{
			opt.pop_back();
		}
		opt.PB(i);
	}
	for (int i = 0; i < K; i++)
	{
		if (dp[i] < 0)
		{
			return 0;
		}
	}
	//|neighbors| - |sum of #s| < 0 => die
	//there are at most sqrtN distinct guys
	return 1;
	//check if the sum of values in subset of k's is < sum cnt's of those k's
	//you need to make a team if
}

Compilation message (stderr)

teams.cpp: In function 'int can(int, int*)':
teams.cpp:260:7: warning: unused variable 'sz' [-Wunused-variable]
   int sz = arr[i].fi;
       ^~

• Subtask 1: 21 / 21
• Subtask 2: 13 / 13
• Subtask 3: 43 / 43
• Subtask 4: 0 / 23