Submission #815106

#	Time	Username	Problem	Language	Result	Execution time	Memory
815106		12345678	Gap (APIO16_gap)	C++17	30 / 100	3066 ms	524288 KiB

gap

#include "gap.h"

#include <bits/stdc++.h>

using namespace std;

#define ll long long

long long findGap(int T, int N)
{
    if (T==1)
    {
        ll x=0, y=1e18, a, b, idx=0, mx=0;
        vector<ll> v;
        while (v.size()<N)
        {
            MinMax(x, y, &a, &b);
            if (a==b) v.push_back(a);
            else v.push_back(a), v.push_back(b);
            x=a+1; y=b-1;
        }
        sort(v.begin(), v.end());
        for (int i=1; i<v.size(); i++) mx=max(mx, v[i]-v[i-1]);
        return mx;
    }
    else
    {
        ll x=0, y=1e18, mn, mx, mmn, mmx;
        vector<ll> v;
        MinMax(x, y, &mn, &mx);
        mmn=mn; mmx=mx;
        v.push_back(mmn);
        v.push_back(mmx);
        ll gap=(mmx-mmn+1)/(N-1);
        for (int p=0; mmn+p+gap<=mmx; p+=gap)
        {
            //printf("%d %d\n", mmn+p+1, min(mmn+p+gap, mmx-1));
            MinMax(mmn+p+1, min(mmn+p+gap, mmx-1), &mn, &mx);
            if (mn==-1) continue;
            v.push_back(mn);
            v.push_back(mx);
        }
        sort(v.begin(), v.end());
        for (int i=1; i<v.size(); i++) mx=max(mx, v[i]-v[i-1]);
        return mx;
    }
}

Compilation message (stderr)

gap.cpp: In function 'long long int findGap(int, int)':
gap.cpp:15:24: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   15 |         while (v.size()<N)
      |                ~~~~~~~~^~
gap.cpp:23:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |         for (int i=1; i<v.size(); i++) mx=max(mx, v[i]-v[i-1]);
      |                       ~^~~~~~~~~
gap.cpp:13:31: warning: unused variable 'idx' [-Wunused-variable]
   13 |         ll x=0, y=1e18, a, b, idx=0, mx=0;
      |                               ^~~
gap.cpp:44:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |         for (int i=1; i<v.size(); i++) mx=max(mx, v[i]-v[i-1]);
      |                       ~^~~~~~~~~

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