Submission #909846

#	Time	Username	Problem	Language	Result	Execution time	Memory
909846		guechotjrhh	Minerals (JOI19_minerals)	C++14	40 / 100	47 ms	3492 KiB

minerals

#include "minerals.h"
#include<vector>
#include<set>
#include<random>
#include<algorithm>
using namespace std;

int n, s;
//2nlog(2n)
random_device rd;
mt19937 g(rd());

void solve(vector<int>& in, vector<int>& rest) {
    shuffle(in.begin(), in.end(), g);
    shuffle(rest.begin(), rest.end(), g);
    if (in.size() == 1) { Answer(in[0], rest[0]); return; }
    
    //better cut - not 1/2
    vector<int> in1, in2;
    int sz1 = 5 * in.size() / 7;
    for (int i = 0; i < sz1; i++) in1.push_back(in[i]);
    for (int i = sz1; i < in.size(); i++) in2.push_back(in[i]);
    
    //get rest for in1. possible better - not to take out right away
    int sz = 0;
    for (int i : in2) sz = Query(i);
    vector<int> rest1, rest2;
    for (int j : rest) {
        if (rest1.size() == in1.size()) { rest2.push_back(j); continue; }
        if (rest2.size() == in2.size()) { rest1.push_back(j); continue; }

        int u = Query(j);
        if (u == sz) rest1.push_back(j);
        else {
            rest2.push_back(j);
            sz = u;
            //Query(j);
        }
    }
    solve(in1, rest1);
    for (int i : in2) Query(i);
    solve(in2, rest2);
}

void Solve(int N) {
    n = N; s = n << 1;
    int sz = 0;
    vector<int> in, rest;
    vector<int> vec(s);
    for (int i = 0; i < s; i++)vec[i] = i + 1;
    shuffle(vec.begin(), vec.end(), g);
    for (int i : vec) {
        if (in.size() < n) {
            int u = Query(i);
            if (u > sz) {
                sz = u;
                in.push_back(i);
            }
            else {
                rest.push_back(i);
            }
        }
        else {
            rest.push_back(i);
        }
    }
    solve(in, rest);
}

Compilation message (stderr)

minerals.cpp: In function 'void solve(std::vector<int>&, std::vector<int>&)':
minerals.cpp:22:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     for (int i = sz1; i < in.size(); i++) in2.push_back(in[i]);
      |                       ~~^~~~~~~~~~~
minerals.cpp: In function 'void Solve(int)':
minerals.cpp:53:23: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   53 |         if (in.size() < n) {
      |             ~~~~~~~~~~^~~

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