Submission #1121649

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121649		rahidilbayramli	Calvinball championship (CEOI15_teams)	C++17	0 / 100	2 ms	592 KiB

teams

#pragma GCC optimize("-O3")
#include<bits/stdc++.h>
#define ll long long
#define ld long double
#define vl vector<ll>
#define vi vector<int>
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define pb push_back
#define sz(v) (ll)(v.size())
#define f first
#define s second
#define pii pair<int, int>
#define pll pair<ll, ll>
using namespace std;
const ll mod = 1e6+7;
void solve()
{
    ll n, i;
    cin >> n;
    ll a[n+5], cnt = 0;
    for(i = 1; i <= n; i++){
        cin >> a[i];
        if(a[i] == i)
            cnt++;
    }
    if(cnt == n)
    {
        ll f[n+5];
        f[1] = 1;
        f[2] = 2;
        ll g = 1;
        for(i = 3; i <= n; i++){
            f[i] = f[i-1] * 2 + g;
            g += 2;
            f[i] %= mod;
        }
        cout << f[n] << "\n";
    }
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    ll tests = 1;
    //cin >> tests;
    while(tests--)
    {
        solve();
    }
}
/*
5 5
1 2 3 4 5
2 3 5 4
3 3 5
1 2 5
2 1 3 3
1 1 3


*/

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