Submission #333262

#	Time	Username	Problem	Language	Result	Execution time	Memory
333262		caoash	Calvinball championship (CEOI15_teams)	C++17	100 / 100	913 ms	748 KiB

teams

#include <bits/stdc++.h> 
using namespace std;

using ll = long long;

using vi = vector<int>;
using vl = vector<ll>;
#define pb push_back
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
#define lb lower_bound
#define ub upper_bound

using pi = pair<int,int>;
#define f first
#define s second
#define mp make_pair

namespace output {
  void pr(int x) {
    cout << x;
  }
  void pr(long x) {
    cout << x;
  }
  void pr(ll x) {
    cout << x;
  }
  void pr(unsigned x) {
    cout << x;
  }
  void pr(unsigned long x) {
    cout << x;
  }
  void pr(unsigned long long x) {
    cout << x;
  }
  void pr(float x) {
    cout << x;
  }
  void pr(double x) {
    cout << x;
  }
  void pr(long double x) {
    cout << x;
  }
  void pr(char x) {
    cout << x;
  }
  void pr(const char * x) {
    cout << x;
  }
  void pr(const string & x) {
    cout << x;
  }
  void pr(bool x) {
    pr(x ? "true" : "false");
  }

  template < class T1, class T2 > void pr(const pair < T1, T2 > & x);
  template < class T > void pr(const T & x);

  template < class T, class...Ts > void pr(const T & t,
    const Ts & ...ts) {
    pr(t);
    pr(ts...);
  }
  template < class T1, class T2 > void pr(const pair < T1, T2 > & x) {
    pr("{", x.f, ", ", x.s, "}");
  }
  template < class T > void pr(const T & x) {
    pr("{"); // const iterator needed for vector<bool>
    bool fst = 1;
    for (const auto & a: x) pr(!fst ? ", " : "", a), fst = 0;
    pr("}");
  }

  void ps() {
    pr("\n");
  } // print w/ spaces
  template < class T, class...Ts > void ps(const T & t,
    const Ts & ...ts) {
    pr(t);
    if (sizeof...(ts)) pr(" ");
    ps(ts...);
  }

  void pc() {
    cout << "]" << endl;
  } // debug w/ commas
  template < class T, class...Ts > void pc(const T & t,
    const Ts & ...ts) {
    pr(t);
    if (sizeof...(ts)) pr(", ");
    pc(ts...);
  }
  #define dbg(x...) pr("[", #x, "] = ["), pc(x);
}

#ifdef mikey 
using namespace output;
#else
using namespace output;
#define dbg(x...)
#endif

const int MX = 10005;
const int MOD = (int) (1e6 + 7);
const ll INF = (ll) 1e18;

ll dp[2][MX];

int main(){
#ifdef mikey 
    freopen("a.in", "r", stdin);
#endif
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n; cin >> n;
    ll ans = 0;
    vl a(n);
    vl pref(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
        pref[i] = a[i];
        if (i) pref[i] = max(pref[i], pref[i - 1]);
    }
    for (int i = 1; i <= n; i++) dp[0][i] = 1;
    for (int i = 0; i < n; i++) {
        if (i) {
            for (int j = 1; j < n; j++) {
                dp[i & 1][j] = (dp[(i & 1) ^ 1][j] * j) % MOD;
                dp[i & 1][j] += dp[(i & 1) ^ 1][j + 1];
                while (dp[i & 1][j] > MOD) dp[i & 1][j] -= MOD;
            }
        }
        int pos = n - (i + 1);
        ans = (ans + (ll) (a[pos] - 1) * dp[i & 1][(pos == 0 ? 0 : pref[pos - 1])]) % MOD;
    }
    cout << (ans + 1) % MOD << '\n';
}

Compilation message (stderr)

teams.cpp:104: warning: "dbg" redefined
  104 | #define dbg(x...)
      | 
teams.cpp:97: note: this is the location of the previous definition
   97 |   #define dbg(x...) pr("[", #x, "] = ["), pc(x);
      |

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