Submission #949229

#	Time	Username	Problem	Language	Result	Execution time	Memory
949229		steveonalex	Gap (APIO16_gap)	C++14	83.51 / 100	52 ms	5180 KiB

gap

#include <bits/stdc++.h>
#include "gap.h"
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
 
#define MASK(i) (1ULL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
#define ALL(v) (v).begin(), (v).end()
 
ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}
 
ll LASTBIT(ll mask){return (mask) & (-mask);}
int pop_cnt(ll mask){return __builtin_popcountll(mask);}
int ctz(ull mask){return __builtin_ctzll(mask);}
int logOf(ull mask){return 63 - __builtin_clzll(mask);}
 
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);}
 
template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b) {a = b; return true;}
        return false;
    }
 
template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b) {a = b; return true;}
        return false;
    }
 
template <class T>
    void printArr(T& container, string separator = " ", string finish = "\n", ostream &out = cout){
        for(auto item: container) out << item << separator;
        out << finish;
    }
 
template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }

// int n;
// vector<ll> a;

// void MinMax(ll l, ll r, ll *mn, ll *mx){
//     cout << "? " << l << " " << r << "\n";
//     ll idx1 = lower_bound(ALL(a), l) - a.begin();
//     ll idx2 = upper_bound(ALL(a), r) - a.begin() - 1;
//     if (idx1 > idx2){
//         *mn = -1;
//         *mx = -1;
//     }
//     *mn = a[idx1];
//     *mx = a[idx2];
// }

namespace Sub1{
    ll solve(int n){
        vector<ll> a;
        ll l = 0, r = 1e18;
        for(int i = 0; i<n; i += 2){
            ll L, R;
            MinMax(l, r, &L, &R);
            a.push_back(L); a.push_back(R);
            l = L + 1, r = R - 1;
        }
        sort(ALL(a));

        ll ans = 0;
        for(int i = 1; i<a.size(); ++i) maximize(ans, a[i] - a[i-1]);
        return ans;
    }
}

namespace Sub2{
    vector<pair<ll, ll>> a;
    ll cap = 0;
    void dnc(ll l, ll r){ 
        if (r - l <= cap){
            ll L, R;
            MinMax(l, r, &L, &R);
            if (L != -1) a.push_back({L, R});
            return;
        } 
        ll mid = (l + r) >> 1;

        dnc(l, mid);
        dnc(mid + 1, r);
    }

    ll solve(int n){
        a.clear();
        ll l = 0, r = 1e18;
        ll L, R;
        MinMax(l, r, &L, &R);
        l = L, r = R;
        cap = (r - l) / n;
        dnc(l, r);

        ll ans = 0;
        for(int i = 1; i<a.size(); ++i) maximize(ans, a[i].first - a[i-1].second);
        return ans;
    }
}

ll findGap(int T, int N){
    if (T == 1) return Sub1::solve(N);
    return Sub2::solve(N);
}


// int main(void){
//     ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

//     cin >> n;
//     a.resize(n);
//     for(int i= 0; i<n; ++i) cin >> a[i];

//     cout << findGap(2, n) << "\n";

//     return 0;
// }

Compilation message (stderr)

gap.cpp: In function 'll Sub1::solve(int)':
gap.cpp:76:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |         for(int i = 1; i<a.size(); ++i) maximize(ans, a[i] - a[i-1]);
      |                        ~^~~~~~~~~
gap.cpp: In function 'll Sub2::solve(int)':
gap.cpp:107:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  107 |         for(int i = 1; i<a.size(); ++i) maximize(ans, a[i].first - a[i-1].second);
      |                        ~^~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 53.5083487467 / 70