Submission #95641

#	Time	Username	Problem	Language	Result	Execution time	Memory
95641		cheeheng	Gap (APIO16_gap)	C++14	70 / 100	65 ms	4100 KiB

gap

#include "gap.h"
#include <bits/stdc++.h>
using namespace std;

long long a[100005];

//void MinMax(long long s, long long t, long long *mn, long long *mx);

long long scamBucket[100005];

long long findGap(int T, int N){
    if(T == 1){
        MinMax(0, 1LL<<60, &a[0], &a[N-1]);
        for(int i = 1; i < (N+1)/2; i ++){
            MinMax(a[i-1]+1, a[N-i]-1, &a[i], &a[N-i-1]);
        }

        long long ans = 0;
        for(int i = 0; i < N-1; i ++){
            //printf("%d %d\n", i, a[i]);
            ans = max(ans, a[i+1]-a[i]);
        }
    }else{
        MinMax(0, 1LL<<60, &a[0], &a[N-1]);
        int scamFactor = N-2;
        vector<long long> scam;
        scam.push_back(a[0]);
        for(int i = 0; i < scamFactor; i ++){
            scamBucket[i] = a[0] + (a[N-1]-a[0])/scamFactor*i;
        }
        scamBucket[scamFactor] = a[N-1];
        for(int i = 0; i < scamFactor; i ++){
            long long x, y;
            MinMax(scamBucket[i]+1, scamBucket[i+1]-(i!=scamFactor-1), &x, &y);
            if(x != -1){
                scam.push_back(x);
                scam.push_back(y);
            }
        }
        scam.push_back(a[N-1]);
        long long ans = 0;
        for(int i = 0; i < (int)scam.size()-1; i ++){
            //printf("%d %d\n", i, a[i]);
            ans = max(ans, scam[i+1]-scam[i]);
        }
        return ans;
    }
}

/*
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;
}

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);
}

*/

Compilation message (stderr)

gap.cpp: In function 'long long int findGap(int, int)':
gap.cpp:48:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

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