Submission #282637

#	Time	Username	Problem	Language	Result	Execution time	Memory
282637		AaronNaidu	Gap (APIO16_gap)	C++14	43.01 / 100	108 ms	6260 KiB

gap

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

ll mn = 0;
ll mx = 0;
ll n;
vector<ll> v;
unordered_map<ll, bool> taken;

/*void MinMax(ll left, ll right, ll *mn, ll *mx) {
    ll x, y;
    cin >> x >> y;
    *mn = x;
    *mx = y;
}*/

void binSearch(ll left, ll right) {
    if (v.size() == n)
    {
        return;
    }
    if (right < left)
    {
        return;
    }
    
    MinMax(left, right, &mn, &mx);
    if (mn == -1)
    {
        return;
    }
    if (taken.find(mn) == taken.end())
    {
        taken.insert({mn, true});
        v.push_back(mn);
    }
    if (taken.find(mx) == taken.end())
    {
        taken.insert({mx, true});
        v.push_back(mx);
    }
    if (mn == mx or mn == mx -1)
    {
        return;
    }
    left = mn+1;
    right = mx-1;
    
    ll med = (left+right)/2;
    binSearch(left, med);
    binSearch(med+1, right);    
}

ll findGap(int t, int N) {
    n = N;
    ll leftPointer = 0;
    ll rightPointer = 1000000000000000000;
    if (t == 1)
    {
        while (v.size() < n)
        {
            MinMax(leftPointer, rightPointer, &mn, &mx);
            v.push_back(mn);
            v.push_back(mx);
            leftPointer = mn+1;
            rightPointer = mx-1;
        }
        sort(v.begin(), v.end());
        ll maxDiff = 0;
        for (int i = 0; i < v.size()-1; i++)
        {
            maxDiff = max(maxDiff, v[i+1]-v[i]);
        }
        return maxDiff;
    }
    binSearch(leftPointer, rightPointer);
    sort(v.begin(), v.end());
    ll maxDiff = 0;
    for (int i = 0; i < v.size()-1; i++)
    {
        maxDiff = max(maxDiff, v[i+1]-v[i]);
    }
    return maxDiff;
}

Compilation message (stderr)

gap.cpp: In function 'void binSearch(ll, ll)':
gap.cpp:20:18: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   20 |     if (v.size() == n)
      |         ~~~~~~~~~^~~~
gap.cpp: In function 'll findGap(int, int)':
gap.cpp:62:25: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   62 |         while (v.size() < n)
      |                ~~~~~~~~~^~~
gap.cpp:72:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   72 |         for (int i = 0; i < v.size()-1; i++)
      |                         ~~^~~~~~~~~~~~
gap.cpp:81:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   81 |     for (int i = 0; i < v.size()-1; i++)
      |                     ~~^~~~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 13.008169338 / 70