Submission #1101789

#	Time	Username	Problem	Language	Result	Execution time	Memory
1101789		raduv	Mouse (info1cup19_mouse)	C++17	84 / 100	2449 ms	3408 KiB

mouse

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <set>
#include <vector>
#include <algorithm>
//#define DEBUG
//#define PRINTQ
#ifndef DEBUG
#include "grader.h"
#endif // DEBUG
const int MAXN = 256;
std::set<int> candidates[MAXN + 1];
std::set<int> available, cavailable;
bool isset[MAXN + 1];
#ifdef DEBUG
int p[MAXN + 1] = {27, 83, 51, 21, 242, 154, 220, 25, 253, 125, 88, 235, 138, 161, 30, 105, 234, 36, 187, 144, 139, 98, 2, 70, 107, 122, 200, 169, 86, 74, 208, 79, 6, 130, 213, 178, 44, 164, 230, 151, 8, 180, 227, 212, 162, 191, 142, 172, 193, 166, 85, 1, 96, 136, 72, 147, 131, 56, 184, 69, 32, 11, 34, 42, 39, 190, 221, 192, 108, 41, 237, 129, 239, 61, 231, 229, 111, 177, 224, 20, 40, 251, 15, 64, 252, 210, 215, 238, 173, 250, 248, 57, 171, 246, 226, 182, 249, 14, 134, 53, 68, 133, 3, 24, 62, 114, 202, 35, 106, 127, 19, 159, 141, 179, 102, 156, 247, 117, 181, 109, 84, 233, 158, 12, 99, 153, 174, 113, 150, 95, 175, 73, 100, 149, 77, 112, 119, 176, 29, 211, 47, 7, 126, 236, 65, 4, 71, 45, 90, 80, 183, 31, 87, 137, 63, 33, 43, 94, 101, 198, 54, 232, 214, 199, 217, 75, 26, 148, 52, 38, 240, 116, 197, 110, 209, 143, 245, 219, 76, 167, 10, 49, 93, 195, 241, 17, 203, 123, 37, 120, 206, 218, 157, 50, 16, 222, 196, 89, 256, 13, 205, 244, 135, 152, 163, 58, 216, 59, 67, 23, 5, 9, 223, 81, 103, 140, 92, 28, 132, 146, 207, 78, 189, 128, 243, 145, 115, 188, 228, 18, 155, 168, 255, 48, 46, 186, 170, 185, 254, 121, 104, 55, 194, 91, 60, 66, 22, 160, 225, 82, 204, 124, 97, 201, 165, 118};
int n = 256;
int nq = 0;
int st1 = 1;
std::vector<int> ans;
#endif // DEBUG
int order_of_key(std::set<int> st, int poz){
  auto it = st.begin();
  for( int i = 1; i <= poz; i++ )
    it++;
  return *it;
}
#ifdef DEBUG
 
int isPermutation(std::vector<int> q){
  std::sort(q.begin(), q.end());
  int i = 1;
  for(auto x : q){
    if(x != i)
      return 0;
    i++;
  }
  return 1;
}
 
#endif // DEBUG
#ifdef DEBUG
int query(std::vector<int> q){
  #ifdef PRINTQ
  for(auto x : q)
    printf("%d ", x);
  printf(" perm : %d", isPermutation(q));
  st1 = std::min(st1, (int)isPermutation(q));
  printf("\n");
 
  #endif // PRINTQ
  nq++;
  int x = 0;
  for( int i = 0; i < n; i++ ){
    if(q[i] == p[i])
      x++;
  }
  return x;
}
#endif // DEBUG
void solve(int n){
  srand(time(0));
  int i, j, x, p;
  for( i = 1; i <= n; i++ ){
    available.insert(i);
    for( j = 1; j <= n; j++ )
      candidates[i].insert(j);
  }
  std::vector<int> q(n);
  for( i = 1; i <= n; i++ ){
    int mn = n + 1;
    for( j = 1; j <= n; j++ )
      if( !isset[j] && candidates[j].size() < mn ){
        mn = candidates[j].size();
        p = j;
      }
    isset[p] = 1;
    while(candidates[p].size() > 1){
      q[p - 1] = order_of_key(candidates[p],  rand() % candidates[p].size());
      cavailable = available;
      available.erase(q[p - 1]);
 
      for( j = 1; j <= n; j++ ){
        if(!isset[j]){
          q[j - 1] = order_of_key(available, rand() % available.size());
          available.erase(q[j - 1]);
        }
      }
 
      available = cavailable;
      #ifdef PRINTQ
      printf("%d available : ", p);
      for( auto x : available )
        printf("%d ", x);
      printf("\n");
      #endif // DEBUG
      if( (x = query(q)) == i - 1 ){
        for( j = 1; j <= n; j++ ){
          if( (!isset[j] || j == p) && candidates[j].find(q[j - 1]) != candidates[j].end())
            candidates[j].erase(q[j - 1]);
        }
      }
      else if(x == n)
        return;
    }
    q[p - 1] = *candidates[p].begin();
    for( j = 1; j <= n; j++ )
      if(!isset[j] && candidates[j].find(q[p - 1]) != candidates[j].end())
        candidates[j].erase(q[p - 1]);
    available.erase(*candidates[p].begin());
  }
  query(q);
}
#ifdef DEBUG
int main(){
  solve(n);
  int i = 0;
  int st = 1;
  for( auto x : ans ){
    if(x != p[i])
      st = 0;
    i++;
  }
  printf("Correct Permutations : %d\n", st1);
  printf("Good Last Permutation : %d\n", st);
  printf("Number Of Queries : %d\n", nq);
  return 0;
}
#endif // DEBUG

Compilation message (stderr)

mouse.cpp: In function 'void solve(int)':
mouse.cpp:74:45: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   74 |       if( !isset[j] && candidates[j].size() < mn ){
      |                        ~~~~~~~~~~~~~~~~~~~~~^~~~
mouse.cpp:107:9: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
  107 |     q[p - 1] = *candidates[p].begin();
      |       ~~^~~

• Subtask 1: 13 / 13
• Subtask 2: 31.99999 / 38
• Subtask 3: 38.999982 / 49