Submission #1146072

#	Time	Username	Problem	Language	Result	Execution time	Memory
1146072		Muaath_5	Gap (APIO16_gap)	C++20	70 / 100	43 ms	3260 KiB

gap

#include <stdio.h>
#include <stdlib.h>

void MinMax(long long, long long, long long*, long long*);

#ifndef MUAATH_5
#include "gap.h"
#endif
#include <bits/stdc++.h>
#define ll long long
using namespace std;

// 22, 6 floor()22/6
// X...#...#....#....#....X

long long findGap(int T, int N)
{
	const ll n = N;
	ll mn, mx;
	MinMax(0, 1e18, &mn, &mx);
	const ll blk = (mx-mn-1)/(n-1) + 1;
	ll sol = blk;
	
	if (T == 1) {
		for (int i = 1; i <=  (n + 1) / 2; i++) {
			if (mx == mn) break;
			ll L=-1, R=-1;
			MinMax(mn+1, mx-1, &L, &R);
			if (L == -1) {sol = max(sol, R - L);break;}
			sol = max(sol, max(L - mn, mx - R - 1));
			mx = R;
			mn = L;
		}
		
		return sol;
	}
	
	// cerr << blk << endl;
	vector<pair<ll, ll>> v;
	ll i = 1;
	for (; mn+i*blk-1 <= mx+blk-2; i++) {
		ll lmn=-1, lmx=-1;
		const ll L = mn + (i-1)*(blk), R = mn+i*blk-1;
		MinMax(L, R, &lmn, &lmx);
		if (lmn != -1) {
			if (v.size())			
				sol = max(sol, lmn - v.back().second);
			v.push_back({lmn, lmx});
		}
	}
	sol = max(sol, mx - v.back().second);
	return sol;
}
#ifdef MUAATH_5

static void my_assert(int k){ if (!k) exit(1); }

static int subtask_num, N;
static long long A[100001];
static long long call_count;

long long findGap(int, int);

void MinMax(long long s, long long t, long long *mn, long long *mx)
{
	int lo = 1, hi = N, left = N+1, right = 0;
	my_assert(s <= t && mn != NULL && mx != NULL);
	while (lo <= hi){
		int mid = (lo+hi)>>1;
		if (A[mid] >= s) hi = mid - 1, left = mid;
		else lo = mid + 1;
	}
	lo = 1, hi = N;
	while (lo <= hi){
		int mid = (lo+hi)>>1;
		if (A[mid] <= t) lo = mid + 1, right = mid;
		else hi = mid - 1;
	}
	if (left > right) *mn = *mx = -1;
	else{
		*mn = A[left];
		*mx = A[right];
	}
	if (subtask_num == 1) call_count++;
	else if (subtask_num == 2) call_count += right-left+2;
}

int main()
{
	FILE *in = stdin, *out = stdout;
	my_assert(2 == fscanf(in, "%d%d", &subtask_num, &N));
	my_assert(1 <= subtask_num && subtask_num <= 2);
	my_assert(2 <= N && N <= 100000);
	for (int i=1;i<=N;i++) my_assert(1 == fscanf(in, "%lld", A+i));
	for (int i=1;i<N;i++) my_assert(A[i] < A[i+1]);
	fprintf(out, "%lld\n", findGap(subtask_num, N));
	fprintf(out, "%lld\n", call_count);
}

#endif

• Subtask 1: 0 / 30
• Subtask 2: 70 / 70