Submission #1043868

#	Time	Username	Problem	Language	Result	Execution time	Memory
1043868		GrindMachine	Minerals (JOI19_minerals)	C++17	70 / 100	19 ms	3412 KiB

minerals

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) (int)a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x,y) ((x+y-1)/(y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a,b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a,b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif

/*

refs:
some other solutions

*/

const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

#include "minerals.h"

vector<pii> ans;

void go(vector<int> &a, vector<int> &b, ll t){
    if(a.empty()) return;
    if(sz(a) == 1){
        ans.pb({a[0],b[0]});
        return;
    }

    int mid1 = sz(a)/3;
    amax(mid1,1);
    int mid2 = sz(a)-mid1;

    int mid = sz(a)/2;
    vector<int> al,ar;
    int d = 0;

    if(!t){
        rep(i,sz(a)){
            if(i < mid1){
                al.pb(a[i]);
                d = Query(a[i]);
            }
            else{
                ar.pb(a[i]);
            }
        }
    }
    else{
        rep(i,sz(a)){
            if(i < mid2){
                al.pb(a[i]);
            }
            else{
                ar.pb(a[i]);
                d = Query(a[i]);
            }
        }
    }

    vector<int> bl,br;

    trav(x,b){
        int res = Query(x);
        if(res == d){
            bl.pb(x);
        }
        else{
            br.pb(x);
        }
        d = res;
    }

    go(al,bl,1);
    go(ar,br,0);
}

void Solve(int n) {
    // int v = Query(1);
    // for (int i = 1; i <= N; ++i) {
    //     Answer(i, 2 * N + 1 - i);
    // }

    vector<int> v1,v2;
    int distinct = 0;

    rep1(i,2*n){
        int x = Query(i);
        if(x == distinct+1){
            v1.pb(i);
            distinct++;
        }
        else{
            v2.pb(i);
        }
    }

    rep1(i,2*n) Query(i);
    
    go(v1,v2,0);

    for(auto [i,j] : ans){
        Answer(i,j);
    }
}

Compilation message (stderr)

minerals.cpp: In function 'void go(std::vector<int>&, std::vector<int>&, ll)':
minerals.cpp:76:9: warning: unused variable 'mid' [-Wunused-variable]
   76 |     int mid = sz(a)/2;
      |         ^~~

• Subtask 1: 6 / 6
• Subtask 2: 25 / 25
• Subtask 3: 9 / 9
• Subtask 4: 30 / 30
• Subtask 5: 0 / 5
• Subtask 6: 0 / 5
• Subtask 7: 0 / 5
• Subtask 8: 0 / 5
• Subtask 9: 0 / 10