Submission #145171

#	Time	Username	Problem	Language	Result	Execution time	Memory
145171		MathStudent2002	Gap (APIO16_gap)	C++14	30 / 100	90 ms	7764 KiB

gap

//wait darn

#include<bits/stdc++.h>
#include <stdio.h>
#include <stdlib.h>
#include "gap.h"

using namespace std;

typedef long long ll;

/*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);
}

*/

long long findGap(int T, int N)
{
	if(T == 1) {
        set<ll> s;
        ll lo = 0, hi = 1000000000000000000;
        ll fi, se;
        for(int i = 0; 2*i < N; i++) {
            MinMax(lo,hi,&fi,&se);
            s.insert(fi);
            s.insert(se);
            lo = fi+1;
            hi = se-1;
        }

        ll ans = 0;

        set<ll>::iterator it2 = s.begin();
        it2++;
        for(set<ll>::iterator it = s.begin(); it2 != s.end();) {
            ans = max(ans, (*it2)-(*it));
            it++;
            it2++;
        }
        return ans;
	}
}

Compilation message (stderr)

gap.cpp: In function 'long long int findGap(int, int)':
gap.cpp:83:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

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