Submission #55280

#	Time	Username	Problem	Language	Result	Execution time	Memory
55280		kingpig9	Robots (IOI13_robots)	C++11	100 / 100	1984 ms	58284 KiB

robots

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

using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int MAXN = 1 << 20;

#define debug(...) fprintf(stderr, __VA_ARGS__)
#define fi first
#define se second
#define all(v) (v).begin(), (v).end()
#define fillchar(a, s) memset((a), (s), sizeof(a))

void compress (vector<int> &v) {
	sort(all(v));
	v.resize(unique(all(v)) - v.begin());
}

int A, B, N;
int *X, *Y, *W, *S;
pii T[MAXN];
int heap[MAXN], *hend;

bool moo (int g) {
	if (g * ll(A + B) < N) {
		return false;
	}

	hend = heap;
	//memory limit is so fucking strict...i don't even understand
	//and then you need a TLE sol...wtf??

	int ptr = 0;
	for (int i = 0; i < A; i++) {
		//insert stuff in
		for (; ptr < N && T[ptr].fi < X[i]; ptr++) {
			*(hend++) = T[ptr].se;
			push_heap(heap, hend);
		}

		for (int taken = 0; hend != heap && taken < g; taken++) {
			pop_heap(heap, (hend--));
		}
	}

	for (; ptr < N; ptr++) {
		*(hend++) = T[ptr].se;
		push_heap(heap, hend);
	}

	//by now you don't even care about weight.
	for (int i = B - 1; i >= 0; i--) {
		//if ur stuck
		if (heap != hend && *heap >= Y[i]) {
			return false;
		}

		for (int taken = 0; hend != heap && taken < g; taken++) {
			pop_heap(heap, (hend--));
		}
	}

	return hend == heap;
}

int putaway (int aaa, int bbb, int nnn, int xxx[], int yyy[], int www[], int sss[]) {
	A = aaa;
	B = bbb;
	N = nnn;
	X = xxx;
	Y = yyy;
	W = www;
	S = sss;

	sort(X, X + A);
	sort(Y, Y + B);

	for (int i = 0; i < N; i++) {
		if (W[i] >= X[A - 1] && S[i] >= Y[B - 1]) {
			return -1;
		}
		T[i] = pii(W[i], S[i]);
	}
	sort(T, T + N);

	//memory is the issue here
	int lo = 0, hi = N;
	while (hi - lo > 1) {
		int mid = (lo + hi) / 2;
		if (moo(mid)) {
			hi = mid;
		} else {
			lo = mid;
		}
	}
	return hi;
}

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 25 / 25
• Subtask 4: 37 / 37
• Subtask 5: 10 / 10