oj.uz

Submission #61615

# Submission time Handle Problem Language Result Execution time Memory
61615 2018-07-26T08:11:41 Z 윤교준(#1780) Homecoming (BOI18_homecoming) C++11
13 / 100
 1000 ms 24252 KB 
#include "homecoming.h"
#include <bits/stdc++.h>
#define pb push_back
#define eb emplace_back
#define allv(V) ((V).begin()),((V).end())
#define sorv(V) sort(allv(V))
#define univ(V) (V).erase(unique(allv(V)),(V).end())
#define revv(V) reverse(allv(V))
#define sz(V) ((int)(V).size())
#define upmin(a,b) (a)=min((a),(b))
#define upmax(a,b) (a)=max((a),(b))
#define rb(x) ((x)&(-(x)))
#define INF (0x3f3f3f3f)
#define INFLL (0x3f3f3f3f3f3f3f3fll)
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<int, ll> pil;
typedef pair<ll, int> pli;

const int MAXN = 2000005;

int PQF[MAXN]; ll PQS[MAXN]; int PQs, PQe;

ll dp[MAXN], S[MAXN*2];
int A[MAXN], B[MAXN];
int O[MAXN];

ll Ans;
int N, K;

void init() {
	Ans = 0;
}

void process(int XX) {
	rotate(A, A+XX, A+N);
	rotate(B, B+XX, B+N);

	S[0] = 0;
	for(int i = 1; i <= N; i++)
		S[i] = S[i-1] + B[i-1];

	PQs = PQe = 0;
	ll mx1 = -INFLL;
	for(int i = 0; i < N-K; i++) {
		if(0 <= i-K) upmax(mx1, dp[i-K]);
		for(; PQs < PQe && PQF[PQs] < max(0, i-K+1); PQs++);
		ll &ret = dp[i];
		ret = ll(A[i]) - S[i+K] + S[i];
		if(PQs < PQe) upmax(ret, PQS[PQs] + A[i] - S[i+K]);
		upmax(ret, mx1 + A[i] - S[i+K] + S[i]);

		ll t = ret + S[i+K];
		for(; PQs < PQe && PQS[PQe-1] <= t; PQe--);
		PQF[PQe] = i; PQS[PQe] = t; PQe++;

		upmax(Ans, ret);
	}

	rotate(A, A+N-XX, A+N);
	rotate(B, B+N-XX, B+N);
}

ll solve(int _N, int _K, int *_A, int *_B) {
	init();
	N = _N; K = _K;
	for(int i = 0; i < N; i++) {
		A[i] = A[i+N] = _A[i];
		B[i] = B[i+N] = _B[i];
	}

	int __t = max(6, 600000 / N);

	{
		ll sum = 0;
		for(int i = 0; i < N; i++)
			sum += ll(A[i]) - B[i];
		upmax(Ans, sum);

		sum = 0;
		for(int i = 0; i < N; i++) sum += B[i];

		S[0] = 0;
		for(int i = 1; i <= N; i++)
			S[i] = S[i-1] + A[i-1];
		for(int i = 1; i <= N; i++)
			S[i+N] = S[i+N-1] + A[i-1];
		for(int i = 0; i < N; i++) {
			ll bsum = sum;
			for(int l = 1; l <= __t && l+K <= N; l++) {
				bsum -= B[i+l-1];
				upmax(Ans, S[i+N-K+1] - S[i+l] - bsum);
			}
		}
	}

	for(int i : {N-1, 0, 1}) process(i);

	srand(20010610);
	for(int i = 0; i < __t && i < N; i++)
		process(rand() % N);

	iota(O, O+__t, 0);
	for(int i = __t; i < N; i++) {
		O[__t] = i;
		sort(O, O+__t+1, [&](int a, int b) { return B[a]-A[a] > B[b]-A[b]; });
	}
	for(int i = 0; i < __t && i < N; i++)
		process(O[i]);

	iota(O, O+__t, 0);
	for(int i = __t; i < N; i++) {
		O[__t] = i;
		sort(O, O+__t+1, [&](int a, int b) { return B[a] > B[b]; });
	}
	for(int i = 0; i < __t && i < N; i++)
		process(O[i]);

	iota(O, O+__t, 0);
	for(int i = __t; i < N; i++) {
		O[__t] = i;
		sort(O, O+__t+1, [&](int a, int b) { return A[a] < A[b]; });
	}
	for(int i = 0; i < __t && i < N; i++)
		process(O[i]);

	return Ans;
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 22 ms 484 KB Output is correct
3 Correct 8 ms 2824 KB Output is correct
4 Correct 30 ms 2824 KB Output is correct
5 Correct 8 ms 2824 KB Output is correct

Subtask #2
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 22 ms 484 KB Output is correct
3 Correct 8 ms 2824 KB Output is correct
4 Correct 30 ms 2824 KB Output is correct
5 Correct 8 ms 2824 KB Output is correct
6 Correct 56 ms 2824 KB Output is correct
7 Correct 47 ms 2824 KB Output is correct
8 Correct 243 ms 2824 KB Output is correct
9 Incorrect 68 ms 2824 KB Output isn't correct
10 Halted 0 ms 0 KB -

Subtask #3
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 349 ms 24252 KB Output is correct
2 Execution timed out 1086 ms 24252 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #4
0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 22 ms 484 KB Output is correct
3 Correct 8 ms 2824 KB Output is correct
4 Correct 30 ms 2824 KB Output is correct
5 Correct 8 ms 2824 KB Output is correct
6 Correct 56 ms 2824 KB Output is correct
7 Correct 47 ms 2824 KB Output is correct
8 Correct 243 ms 2824 KB Output is correct
9 Incorrect 68 ms 2824 KB Output isn't correct
10 Halted 0 ms 0 KB -