Submission #579995

#	Time	Username	Problem	Language	Result	Execution time	Memory
579995		stevancv	Gap (APIO16_gap)	C++14	100 / 100	68 ms	2240 KiB

gap

#include <bits/stdc++.h>
#include "gap.h"
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
#define smin(a, b) a = min(a, b)
#define smax(a, b) a = max(a, b)
using namespace std;
const int N = 1e5 + 2;
ll findGap(int t, int n) {
    if (t == 1) {
        vector<ll> a(n);
        ll mn = 0; ll mx = 1e18;
        for (int i = 0; i < n; i++) {
            if (i > n - i - 1) break;
            MinMax(mn, mx, &a[i], &a[n - i - 1]);
            mn = a[i] + 1;
            mx = a[n - i - 1] - 1;
        }
        ll ans = 0;
        for (int i = 1; i < n; i++) smax(ans, a[i] - a[i - 1]);
        return ans;
    }
    vector<ll> a;
    ll mn = 0; ll mx = 1e18;
    MinMax(0, 1e18, &mn, &mx);
    ll gap = (mx - mn + n - 2) / (n - 1);
    a.push_back(mn);
    a.push_back(mx);
    for (ll i = mn + 1; i < mx; i += gap) {
        ll p = 0; ll q = 0;
        MinMax(i, i + gap - 1, &p, &q);
        if (p != -1) a.push_back(p);
        if (q != -1 && p < q) a.push_back(q);
    }
    sort(a.begin(), a.end());
    ll ans = 0;
    for (int i = 1; i < a.size(); i++) smax(ans, a[i] - a[i - 1]);
    return ans;
}

Compilation message (stderr)

gap.cpp: In function 'long long int findGap(int, int)':
gap.cpp:39:23: 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 < a.size(); i++) smax(ans, a[i] - a[i - 1]);
      |                     ~~^~~~~~~~~~

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