Submission #203350

#	Time	Username	Problem	Language	Result	Execution time	Memory
203350		theStaticMind	Minerals (JOI19_minerals)	C++14	85 / 100	176 ms	6224 KiB

minerals

#include<bits/stdc++.h>
#define pb push_back
#define ii pair<int,int>
#define all(x) (x).begin(),(x).end()
#define sz(x) (int)(x).size()
#define INF 1000000000//00000000
#define modulo 1000000007
#define mod 998244353
//#define int long long int
using namespace std;

#include "minerals.h"

int last = 0;
unordered_set<int> S;

void add(int x){
      if(S.count(x))S.erase(x);
      else S.insert(x);
}

void extract(vector<int>& A, vector<int>& B, vector<int>& X, vector<int>& Y){
      int n = sz(A), m = sz(B);
      int b = 0;
      for(int i = 0; i < m; i++) swap(B[rand() % m], B[rand() % m]);
      for(int i = 0; i < m; i++){
            int v;
            if(b == sz(A)) v = INF;
            else v = Query(B[i]), add(B[i]);
            if(v == last){
                  X.pb(B[i]);
                  b++;
            }
            else Y.pb(B[i]);
            if(v != INF)
            last = v;
      }
}

void divide(vector<int>& A, vector<int>& B){
      int n = A.size();
      if(n == 1){
            Answer(A[0], B[0]);
            return;
      }
      vector<int> X, Y;
      vector<int> tempA, tempB;
      for(int i = 0; i < n / 2; i++)tempA.pb(A[i]);
      for(int i = n / 2; i < n; i++)tempB.pb(A[i]);
      if(!(S.count(tempA[0]) ^ S.count(tempB[0]))){
            if(tempB.size() > tempA.size()) swap(tempA, tempB);
            for(int i = 0; i < tempB.size(); i++) last = Query(tempB[i]), add(tempB[i]);
      }
      if(S.count(tempB[0])){
            swap(tempA, tempB);
      }
      extract(tempA, B, X, Y);
      divide(tempA, X);
      divide(tempB, Y);
}

void Solve(int N) {
      vector<int> A, B;
      vector<int> arr;
      for(int i = 1; i <= 2 * N; i++)arr.pb(i);
      srand(time(NULL));
      for(int i = 0; i < 2 * N; i++) swap(arr[rand() % sz(arr)], arr[rand() % sz(arr)]);
      for(auto i : arr){
            int q;
            if(last == N) q = last;
            else q = Query(i);
            S.insert(i);
            if(last == q){
                  B.pb(i);
            }
            else{
                  A.pb(i);
            }
            last = q;
      }
      divide(A, B);
}

Compilation message (stderr)

minerals.cpp: In function 'void extract(std::vector<int>&, std::vector<int>&, std::vector<int>&, std::vector<int>&)':
minerals.cpp:23:11: warning: unused variable 'n' [-Wunused-variable]
       int n = sz(A), m = sz(B);
           ^
minerals.cpp: In function 'void divide(std::vector<int>&, std::vector<int>&)':
minerals.cpp:52:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int i = 0; i < tempB.size(); i++) last = Query(tempB[i]), add(tempB[i]);
                            ~~^~~~~~~~~~~~~~

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