Submission #74515

#	Time	Username	Problem	Language	Result	Execution time	Memory
74515		tincamatei	Gap (APIO16_gap)	C++14	30 / 100	76 ms	39176 KiB

gap

#include <bits/stdc++.h>

#ifndef HOME
	#include "gap.h"
#else

long long findGap(int, int);

namespace grader {
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;

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;
}

void grader() {
	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, "Gap : %lld\n", findGap(subtask_num, N));
	fprintf(out, "Calls: %lld\n", call_count);
}

}

void MinMax(long long s, long long t, long long *mn, long long *mx) {
	grader::MinMax(s, t, mn, mx);
}

int main()
{
	grader::grader();
}


#endif

const int MAX_N = 100000;
const long long INF = 1000000000000000000;

long long v[MAX_N];

long long findGap(int T, int N) {
	if(T == 1) {
		long long rez = 0LL;
		MinMax(0, INF, &v[0], &v[N - 1]);
		for(int i = 1; i <= (N - 1) / 2; ++i)
			MinMax(v[i - 1] + 1, v[N - i] - 1, &v[i], &v[N - i - 1]);
		
		for(int i = 0; i < N - 1; ++i)
			if(v[i + 1] - v[i] > rez)
				rez = v[i + 1] - v[i];
		return rez;
	}
	return 0LL;
}

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