Submission #646386

#	Time	Username	Problem	Language	Result	Execution time	Memory
646386		Tenis0206	Gap (APIO16_gap)	C++11	100 / 100	61 ms	3124 KiB

gap

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

using namespace std;

long long n;

long long bck = 1000;
long long pmax = 0;

long long solve1()
{
    int l = 1;
    int r = n;
    long long st = 0, dr = 1e18;
    vector<long long> a,b;
    while(l<=r)
    {
        long long x,y;
        MinMax(st,dr,&x,&y);
        a.push_back(x);
        b.push_back(y);
        ++l;
        --r;
        st = x + 1;
        dr = y - 1;
    }
    vector<long long> v;
    for(auto it : a)
    {
        v.push_back(it);
    }
    reverse(b.begin(),b.end());
    for(auto it : b)
    {
        v.push_back(it);
    }
    long long Max = 0;
    for(int i=1;i<v.size();i++)
    {
        Max = max(Max,v[i] - v[i-1]);
    }
    return Max;
}

long long solve2(long long st, long long dr)
{
    MinMax(st,dr,&st,&dr);
    long long pmax = (dr - st + n - 2) / (n - 1);
    long long last = -1;
    long long rez = -1;
    if(n==2)
    {
        return dr - st;
    }
    while(st<=dr)
    {
        long long l = st;
        long long r = min(dr,l + pmax);
        MinMax(l,r,&l,&r);
        if(l!=-1 && last!=-1)
        {
            rez = max(rez,l-last);
        }
        if(l!=-1)
        {
            last = r;
        }
        st += pmax + 1;
    }
    return rez;
}

long long findGap(int t, int N)
{
    n = N;
    if(t==1)
    {
        return solve1();
    }
    return solve2(1,1e18);
}

Compilation message (stderr)

gap.cpp: In function 'long long int solve1()':
gap.cpp:39:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |     for(int i=1;i<v.size();i++)
      |                 ~^~~~~~~~~

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