Submission #1121929

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121929		vjudge1	Calvinball championship (CEOI15_teams)	C++17	100 / 100	356 ms	760 KiB

teams

#include<bits/stdc++.h>

#define ll long long
#define pb push_back
#define in insert
#define fi first
#define se second
#define vl vector<ll>
#define all(v) v.begin(), v.end()
#define endl "\n"

using namespace std;
const int sz = 1e4 + 5; /// mind this
const int MAX = 2e6 + 123;
const int BS = 61;
const int mod = 1e6 + 7;
ll dp[2][sz];
ll bp(ll a, ll b){
    ll res = 1;
    a %= mod;
    while(b){
        if(b & 1){
            res = (res * a) % mod;
        }
        a = (a * a) % mod;
        b >>= 1;
    }
    return res;
}
void solve(){
    ll n, i, j, hi = 0, ans = 1;
    cin >> n;
    vl v(n + 1), p(n + 1, 0);
    dp[0][0] = 1;
    for(i = 1; i <= n; i++){
        cin >> v[i];
        p[i] = max(p[i - 1], v[i]);
        dp[0][i] = 1;
    }
    for(i = 0; i < n; i ++){
        // cout << i << ": ";
        for(j = 0; i && j <= n - i; j++){
            dp[i & 1][j] = (dp[(i & 1) ^ 1][j + 1] + (dp[(i & 1) ^ 1][j] * j) % mod) % mod;
            // cout << dp[i][j] << ' ';
        }
        for (j = 1; j < v[n - i]; j++){
            ans = (ans + dp[i & 1][max(j, p[n - i - 1])]) % mod;
        }

        // cout << endl;
    }
    cout << ans<< endl;
}
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    ll t = 1;
    // cin >> t;
    while(t--){
        solve();
    }
}

/*
3
1 2 2
*/

Compilation message (stderr)

teams.cpp: In function 'void solve()':
teams.cpp:31:17: warning: unused variable 'hi' [-Wunused-variable]
   31 |     ll n, i, j, hi = 0, ans = 1;
      |                 ^~

• 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