Submission #1113226

#	Time	Username	Problem	Language	Result	Execution time	Memory
1113226		ntdaccode	Binaria (CCO23_day1problem1)	C++17	25 / 25	90 ms	41488 KiB

Main

#include<bits/stdc++.h>
#define fori(i,a,b) for(int i = a;i <= b; i++)
#define int long long

using namespace std;

typedef pair<int,int> ii;
typedef tuple<int,int,int> tp;

const int M = 2e6 + 10;
const int N = 1e3 + 10;
const int mod = 1e6 + 3;

int n,k,a[M],id[M];

int finded(int u)
{
  return (id[u] < 0 ? u : id[u] = finded(id[u]));
}

void unioned(int u,int v)
{
  u = finded(u);
  v = finded(v);
  if(u == v) return ;
  if(u < v) swap(u,v);
  id[u] += id[v];
  id[v] = u;
  return ;
}

int power(int a,int m)
{
  if(m == 0) return 1;
  int t = power(a,m/2);
  t = (t * t) % mod;
  if(m % 2) t = (t * a) % mod;
  return t;
}

int C(int k,int n)
{
  if(k > n) return 0;
  int res = 1;
  for(int i = k + 1;i <= n; i++) res = (res * (i % mod) ) % mod;
  int du = 1;
  for(int i = 1;i <= n - k; i++) du = (du * (i % mod) ) % mod;
  du = power(du,mod - 2) % mod;
  return (res * du) % mod;
}
int32_t main()
{
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  if(fopen("1.inp","r"))
  {
    freopen("1.inp","r",stdin);
    freopen("1.out","w",stdout);
  }
  #define task ""
  if(fopen(task".inp","r"))
  {
    freopen(task".inp","r",stdin);
    freopen(task".out","w",stdout);
  }

  cin >> n >> k;
  for(int i = 1;i <= n - k + 1; i++) cin >> a[i];
  for(int i = 1;i <= 2 * n + 1; i++) id[i] = -1;
  for(int i = 1;i <= n - k ; i++) {
    if(abs(a[i] - a[i + 1]) > 1 || a[i] > k || a[i + 1] > k ) {
        cout << 0 ;
        return 0;
    }
    if(a[i] == a[i + 1]) {
        unioned(i,i + k );
        unioned(i + n,i + k + n);
        //cout << i + k  - 1 << " " << i + k - 1 + n << "\n";
    }
    if(a[i] == a[i + 1] + 1) {
      unioned(i + n,i + k);
      unioned(i,2 * n + 1);
      unioned(i + k + n,2 * n + 1);
    }
    if(a[i] == a[i + 1] - 1) {
      unioned(i,i + k + n);
      unioned(i + n, 2 * n + 1);
      unioned(i + k, 2 * n + 1);
    }
  }
  int K = k;
  for(int i = 1;i <= k ; i++) {
    int u = finded(i);
    int v = finded(i + n);
    if(u == 2 * n + 1 && v == 2 * n + 1) {
      cout << 0;
      return 0;
    }
    if(v == 2 * n + 1) K--;
    if(u == 2 * n + 1) K--,a[1]--;
  }

  cout << C(a[1],K) % mod;
}

Compilation message (stderr)

Main.cpp: In function 'int32_t main()':
Main.cpp:58:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   58 |     freopen("1.inp","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~
Main.cpp:59:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |     freopen("1.out","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~
Main.cpp:64:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |     freopen(task".inp","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
Main.cpp:65:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |     freopen(task".out","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 3 / 3
• Subtask 3: 4 / 4
• Subtask 4: 4 / 4
• Subtask 5: 4 / 4
• Subtask 6: 7 / 7