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Submission #1103315

# Submission time Handle Problem Language Result Execution time Memory
1103315 2024-10-20T16:54:21 Z matthew Mouse (info1cup19_mouse) C++17
80.9231 / 100
 375 ms 3408 KB 
#include <bits/stdc++.h>
using namespace std;
#include "grader.h"

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
static inline int genrand() {
  return uniform_int_distribution<int>()(rng);
}
 
const int MAX_N = 256;
 
// candidates[i] = ce numere pot sa apara pe pozitia i
std::set<int> candidates[MAX_N];
int perm[MAX_N];
char vis[MAX_N];
int order[MAX_N];
 
#ifdef LOCAL
int query(std::vector<int> guess);
#endif

void init_candidates(int n) {
  for(int i = 0; i < n; i++) {
    candidates[i].clear();
    for(int j = 0; j < n; j++) {
      candidates[i].insert(j);
    }
  }
}

#ifdef LOCAL
int n, qs;
std::vector<int> x;
#endif
bool is_perm(int n) {
  std::vector<int> p;
  p.clear();
  for(int i = 0; i < n; i++) {
    p.push_back(perm[i]);
  }
  std::sort(p.begin(), p.end());
  for(int i = 0; i < n; i++) {
    if(p[i] != i) {
      return false;
    }
  }
  return true;
}

int ask(int n) {
  assert(is_perm(n));
  std::vector<int> guess;
  for(int i = 0; i < n; i++) {
    guess.push_back(perm[order[i]] + 1);
  }
  int ans = query(guess);
  if(ans == n) {
    exit(0); // heheheha
  } else {
    return ans;
  }
}
 
int get_rand_from_set(std::set<int> s) {
  int size = s.size();
  int pos = genrand() % size;
  auto it = s.begin();
  std::advance(it, pos);
  return *it;
}
 
void find_permutation(int n) {
  for(int i = 0; i < n; i++) {
    assert(candidates[i].size() > 0);
    while(candidates[i].size() > 1) {
      // completam pozitiile i..n-1
      perm[i] = get_rand_from_set(candidates[i]);
      for(int j = 0; j < n; j++) {
        vis[j] = 0;
      }
      for(int j = 0; j <= i; j++) {
        vis[perm[j]] = 1;
      }
      for(int j = i + 1; j < n; j++) {
        int remaining = n - j;
        int idx = 0;
        int r = genrand();
        int pos = r % remaining;
        for(int k = 0; k <= pos; k++) {
          while(idx < n && vis[idx]) {
            idx++;
          }
          if(k < pos) {
            idx++;
          }
        }
        perm[j] = idx;
        vis[idx] = 1;
      }
      int q = ask(n);
      if(q == i) {
        for(int j = i; j < n; j++) {
          candidates[j].erase(perm[j]);
        }
      }
    }
    perm[i] = *candidates[i].begin();
    for(int j = i + 1; j < n; j++) {
      candidates[j].erase(perm[i]);
    }
  }
}
 
void solve(int n) {
  for(int i = 0; i < n; i++) {
    order[i] = i;
  }
  shuffle(order, order + n, rng);
  srand(time(0));
  init_candidates(n);
  find_permutation(n);
  int xx = ask(n);
  assert(xx == n);
}

#ifdef LOCAL
int main() {
  scanf("%d", &n);
 
  for(int i = 0; i < n; i++) {
    int a;
    scanf("%d", &a);
    x.push_back(a);
  }
 
  qs = 0;
  solve(n);
 
  return 0;
}
int query(std::vector<int> guess) {
  qs++;
  int cnt = 0;
  for(int i = 0; i < n; i++) {
    cnt += (guess[i] == x[i]);
  }
  printf("answer %d for query %d:\n", cnt, qs);
  for(int i = 0; i < n; i++) {
    printf("%d ", guess[i]);
  }
  printf("\n");
  return cnt;
}
#endif

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Correct! Number of queries: 28
2 Correct 1 ms 336 KB Correct! Number of queries: 5
3 Correct 1 ms 336 KB Correct! Number of queries: 12
4 Correct 1 ms 336 KB Correct! Number of queries: 26
5 Correct 1 ms 336 KB Correct! Number of queries: 41
6 Correct 1 ms 336 KB Correct! Number of queries: 26

Subtask #2
31.99999 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Correct! Number of queries: 28
2 Correct 1 ms 336 KB Correct! Number of queries: 5
3 Correct 1 ms 336 KB Correct! Number of queries: 12
4 Correct 1 ms 336 KB Correct! Number of queries: 26
5 Correct 1 ms 336 KB Correct! Number of queries: 41
6 Correct 1 ms 336 KB Correct! Number of queries: 26
7 Correct 13 ms 336 KB Correct! Number of queries: 600
8 Correct 11 ms 336 KB Correct! Number of queries: 600
9 Correct 8 ms 336 KB Correct! Number of queries: 500
10 Correct 10 ms 336 KB Correct! Number of queries: 600
11 Correct 10 ms 336 KB Correct! Number of queries: 500
12 Correct 9 ms 336 KB Correct! Number of queries: 500
13 Correct 8 ms 336 KB Correct! Number of queries: 500
14 Correct 9 ms 336 KB Correct! Number of queries: 500
15 Correct 10 ms 336 KB Correct! Number of queries: 600
16 Correct 10 ms 336 KB Correct! Number of queries: 600

Subtask #3
35.923076 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Correct! Number of queries: 28
2 Correct 1 ms 336 KB Correct! Number of queries: 5
3 Correct 1 ms 336 KB Correct! Number of queries: 12
4 Correct 1 ms 336 KB Correct! Number of queries: 26
5 Correct 1 ms 336 KB Correct! Number of queries: 41
6 Correct 1 ms 336 KB Correct! Number of queries: 26
7 Correct 13 ms 336 KB Correct! Number of queries: 600
8 Correct 11 ms 336 KB Correct! Number of queries: 600
9 Correct 8 ms 336 KB Correct! Number of queries: 500
10 Correct 10 ms 336 KB Correct! Number of queries: 600
11 Correct 10 ms 336 KB Correct! Number of queries: 500
12 Correct 9 ms 336 KB Correct! Number of queries: 500
13 Correct 8 ms 336 KB Correct! Number of queries: 500
14 Correct 9 ms 336 KB Correct! Number of queries: 500
15 Correct 10 ms 336 KB Correct! Number of queries: 600
16 Correct 10 ms 336 KB Correct! Number of queries: 600
17 Correct 373 ms 3408 KB Correct! Number of queries: 4100
18 Correct 320 ms 3320 KB Correct! Number of queries: 3700
19 Correct 293 ms 3152 KB Correct! Number of queries: 3800
20 Correct 342 ms 3408 KB Correct! Number of queries: 4000
21 Correct 303 ms 3152 KB Correct! Number of queries: 3900
22 Correct 311 ms 3152 KB Correct! Number of queries: 3700
23 Correct 316 ms 3152 KB Correct! Number of queries: 3800
24 Correct 322 ms 3408 KB Correct! Number of queries: 3900
25 Correct 344 ms 3408 KB Correct! Number of queries: 4100
26 Correct 375 ms 3408 KB Correct! Number of queries: 4100