oj.uz

Submission #748070

# Submission time Handle Problem Language Result Execution time Memory
748070 2023-05-25T11:15:41 Z Sam_a17 Group Photo (JOI21_ho_t3) C++17
12 / 100
 170 ms 340 KB 
#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
//#include "temp.cpp"
#include <cstdio>
using namespace std;
 
#ifndef ONLINE_JUDGE
#define dbg(x) cerr << #x <<" "; print(x); cerr << endl;
#else
#define dbg(x)
#endif
 
#define sz(x) (int((x).size()))
#define len(x) (int)x.length()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define clr(x) (x).clear()
#define uniq(x) x.resize(unique(all(x)) - x.begin());
 
#define pb push_back
#define popf pop_front
#define popb pop_back
 
void print(long long t) {cerr << t;}
void print(int t) {cerr << t;}
void print(string t) {cerr << t;}
void print(char t) {cerr << t;}
void print(double t) {cerr << t;}
void print(long double t) {cerr << t;}
void print(unsigned long long t) {cerr << t;}
 
template <class T, class V> void print(pair <T, V> p);
template <class T> void print(vector <T> v);
template <class T> void print(set <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T> void print(multiset <T> v);
template <class T> void print(T v[],T n) {cerr << "["; for(int i = 0; i < n; i++) {cerr << v[i] << " ";} cerr << "]";}
template <class T, class V> void print(pair <T, V> p) {cerr << "{"; print(p.first); cerr << ","; print(p.second); cerr << "}";}
template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(deque <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(set <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(multiset <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void print(map <T, V> v) {cerr << "[ "; for (auto i : v) {print(i); cerr << " ";} cerr << "]";}
 
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define nl '\n'
 
// for random generations
mt19937 myrand(chrono::steady_clock::now().time_since_epoch().count());
// mt19937 myrand(131);

// for grid problems
int dx[8] = {-1,0,1,0,1,-1,1,-1};
int dy[8] = {0,1,0,-1,1,1,-1,-1};
 
// lowest / (1 << 17) >= 1e5 / (1 << 18) >= 2e5 / (1 << 21) >= 1e6
void fastIO() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr); cout.tie(nullptr);
}
// file in/out
void setIO(string str = "") {
  fastIO();
 
  if (str != "") {
    freopen((str + ".in").c_str(), "r", stdin);
    freopen((str + ".out").c_str(), "w", stdout);
  }
}
// Indexed Set
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
const int N = 5005;

// bit
struct fenwick {
  int size;
  vector<long long> tree; 

  void init(int size_) {
    tree.assign(size_ + 2, 0);
    size = size_;
  }

  void upd(int u, long long v) {
    while(u <= size) {
      tree[u] += v;
      u += u & (-u);
    }
  }

  long long qry(int u) {
    long long sum = 0;
    while(u > 0) {
      sum += tree[u];
      u -= u & (-u); // lsb
    }
    return sum;
  }

  long long sum(int l, int r) {
    return qry(r) - qry(l - 1);
  }

} ft;

int n, pos[N];

int get(vector<int>& a, vector<int>& b) {
  ft.init(n + 1);

  int ans = 0;
  for(int i = 0; i < n; i++) {
    int wh = pos[b[i]];
    ans += wh - 1 - ft.qry(wh);
    ft.upd(wh, 1);
  }

  return ans;
}

void solve_() {
  cin >> n;
  vector<int> a(n);

  for(int i = 0; i < n; i++) {
    cin >> a[i];
    pos[a[i]] = i + 1;
  }

  int ans = n * n;
  for(int i = 1; i < (1 << n); i++) {
    if(!(i & 1)) continue;

    vector<int> b(n);
    int it = n, lst = n - 1;

    for(int j = n - 1; j >= 0; j--) {
      if(i & (1 << j)) {
        b[j] = it;
        it -= (lst - j + 1);
        lst = j - 1;
      }
    }

    for(int j = 0; j < n; j++) {
      if(b[j]) continue;
      b[j] = b[j - 1] - 1;
    }

    ans = min(ans, get(a, b));
  }

  cout << ans << '\n';
}

int main() {
  setIO();
  
  auto solve = [&](int test_case)-> void {
    while(test_case--) {
      solve_();
    }

  };
 
  int test_cases = 1; 
  // cin >> test_cases;
  solve(test_cases);
 
  return 0;
}

Compilation message

Main.cpp: In function 'void setIO(std::string)':
Main.cpp:67:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |     freopen((str + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:68:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |     freopen((str + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 336 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 0 ms 332 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 336 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 0 ms 332 KB Output is correct
11 Correct 37 ms 212 KB Output is correct
12 Correct 82 ms 212 KB Output is correct
13 Correct 79 ms 308 KB Output is correct
14 Correct 159 ms 212 KB Output is correct
15 Correct 169 ms 332 KB Output is correct
16 Correct 162 ms 212 KB Output is correct
17 Correct 169 ms 212 KB Output is correct
18 Correct 164 ms 332 KB Output is correct
19 Correct 165 ms 216 KB Output is correct
20 Correct 170 ms 308 KB Output is correct

Subtask #3
0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 336 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 0 ms 332 KB Output is correct
11 Correct 37 ms 212 KB Output is correct
12 Correct 82 ms 212 KB Output is correct
13 Correct 79 ms 308 KB Output is correct
14 Correct 159 ms 212 KB Output is correct
15 Correct 169 ms 332 KB Output is correct
16 Correct 162 ms 212 KB Output is correct
17 Correct 169 ms 212 KB Output is correct
18 Correct 164 ms 332 KB Output is correct
19 Correct 165 ms 216 KB Output is correct
20 Correct 170 ms 308 KB Output is correct
21 Incorrect 1 ms 340 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 336 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 0 ms 332 KB Output is correct
11 Correct 37 ms 212 KB Output is correct
12 Correct 82 ms 212 KB Output is correct
13 Correct 79 ms 308 KB Output is correct
14 Correct 159 ms 212 KB Output is correct
15 Correct 169 ms 332 KB Output is correct
16 Correct 162 ms 212 KB Output is correct
17 Correct 169 ms 212 KB Output is correct
18 Correct 164 ms 332 KB Output is correct
19 Correct 165 ms 216 KB Output is correct
20 Correct 170 ms 308 KB Output is correct
21 Incorrect 1 ms 340 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #5
0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 336 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 0 ms 332 KB Output is correct
11 Correct 37 ms 212 KB Output is correct
12 Correct 82 ms 212 KB Output is correct
13 Correct 79 ms 308 KB Output is correct
14 Correct 159 ms 212 KB Output is correct
15 Correct 169 ms 332 KB Output is correct
16 Correct 162 ms 212 KB Output is correct
17 Correct 169 ms 212 KB Output is correct
18 Correct 164 ms 332 KB Output is correct
19 Correct 165 ms 216 KB Output is correct
20 Correct 170 ms 308 KB Output is correct
21 Incorrect 1 ms 340 KB Output isn't correct
22 Halted 0 ms 0 KB -