Submission #795645

#	Time	Username	Problem	Language	Result	Execution time	Memory
795645		SlavicG	Minerals (JOI19_minerals)	C++17	75 / 100	876 ms	2392 KiB

minerals

#include <bits/stdc++.h>
#include "minerals.h"
using namespace std;
 
mt19937 rng(69);
void Solve(int n) {
    vector<int> p1, p2;
    int ans = 0, prevans = -1;
    vector<int> bulanea(2 * n);
    iota(bulanea.begin(), bulanea.end(), 1);
    shuffle(bulanea.begin(), bulanea.end(), rng);
    for(int i: bulanea) {
        ans = Query(i);
        if(ans == prevans) {
            p2.push_back(i);
        } else {
            p1.push_back(i);
        }
        prevans = ans;
    }
    assert(p1.size() == n && p2.size() == n);
    vector<int> pr(n, 0);
    vector<bool> bagat(n, 1);
    vector<int> bit_order;
    vector<int> best_order; int mn = INT_MAX;
    for(int bit = 0; (1 << bit) < n; ++bit) {
        bit_order.push_back(bit);
    }
    int f = 0;
    while(f++ < 550) {
        vector<bool> bruh(n, true);
        int cost = 0;
        for(int b: bit_order) {
            for(int i = 0; i < n; ++i) {
                if(i >> b & 1) {
                    if(!bruh[i]) ++cost;
                    bruh[i] = 1;
                } else {
                    if(bruh[i]) ++cost;
                    bruh[i] = 0;
                }
            }
        }
        if(cost < mn) {
            mn = cost;
            best_order = bit_order;
        }
        shuffle(bit_order.begin(), bit_order.end(), rng);
    }
    iota(best_order.begin(), best_order.end(), 0);
    for(int bit: best_order) {
        int cntt = 0;
        for(int i = 0; i < n; ++i) {
            if(i >> bit & 1) {
                ++cntt;
                if(!bagat[i]) prevans = Query(p1[i]);
                bagat[i] = 1;
            } else {
                if(bagat[i]) prevans = Query(p1[i]);
                bagat[i] = 0;
            }
        }
        for(int i = 0; i < n && cntt; ++i) {
            if(pr[i] + (1 << bit) >= n) continue;
            int ans = Query(p2[i]);
            if(ans == prevans) {
                pr[i] += (1 << bit);
                --cntt;
            }
            prevans = ans;
        }
    }
    for(int i = 0; i < n; ++i) {
        Answer(p2[i], p1[pr[i]]);
    }
}
/*
4
1 5
2 6
3 4
7 8
*/

Compilation message (stderr)

In file included from /usr/include/c++/10/cassert:44,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:33,
                 from minerals.cpp:1:
minerals.cpp: In function 'void Solve(int)':
minerals.cpp:21:22: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   21 |     assert(p1.size() == n && p2.size() == n);
      |            ~~~~~~~~~~^~~~
minerals.cpp:21:40: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   21 |     assert(p1.size() == n && p2.size() == n);
      |                              ~~~~~~~~~~^~~~

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