Submission #86733

#	Time	Username	Problem	Language	Result	Execution time	Memory
86733		dimash241	Calvinball championship (CEOI15_teams)	C++17	70 / 100	134 ms	66560 KiB

teams

# include <stdio.h>
# include <bits/stdc++.h>


#define _USE_MATH_DEFINES_
#define ll long long
#define ld long double
#define Accepted 0
#define pb push_back
#define mp make_pair
#define sz(x) (int)(x.size())
#define every(x) x.begin(),x.end()
#define F first
#define S second
#define For(i,x,y)  for (int i = x; i <= y; i ++) 
#define FOr(i,x,y)  for (int i = x; i >= y; i --)
#define SpeedForce ios_base::sync_with_stdio(0), cin.tie(0)
// ROAD to...                                                                                                                                                                                                                Red

using namespace std;

inline bool isvowel (char c) {
	c = tolower(c);
    if (c == 'a' || c == 'e' || c == 'i' || c == 'y' || c == 'o' || c == 'u') return 1;
    return 0;
}

const double eps = 0.000001;
const ld pi = acos(-1);
const int maxn = 1e7 + 9;
const int mod = 1000007;
const ll MOD = 1e18 + 9;
const ll INF = 1e18 + 123;
const int inf = 2e9 + 11;
const int mxn = 1e6 + 9;
const int N = 6e5 + 123;                                          
const int M = 22;
const int pri = 997;
const int Magic = 2101;

const int dx[] = {-1, 0, 1, 0};
const int dy[] = {0, -1, 0, 1};
 
int n;
int dp[10101][10101];
int a[10101];
     
int main () {
	cin >> n;
	int ans = 1;
	For (i, 1, n) {
  		cin >> a[i];
  	}
  	int t = *max_element(a + 1, a + n + 1);
	For (i, 0, n + 1) dp[0][i] = 1;
	For (i, 1, n) {
		for (int j = n + 1; j >= 0; j --) 		{
			dp[i][j] = (j * (ll)dp[i - 1][j]) % mod + dp[i - 1][j + 1];
			if (dp[i][j] >= mod) dp[i][j] -= mod;
		}
	}
	/*
	For (i, 0, n - 1) {
		cout << i << ":\n";
		for (int j = n; j >= 1; j --) {
			cout << j << ' ' << dp[i][j] << '\n';
		}
	} */

	int mx = 0;
	For (i, 0, n - 1) {
		mx = max(mx, a[i]);
		ans += (a[i + 1] - 1) * (ll)dp[n - i - 1][mx] % mod;
		//cout << dp[n - i][mx] << '\n';
		if (ans >= mod) ans -= mod;
		
	}
    
  	cout << ans << '\n';
    
    return Accepted;
}

// Coded By OB

Compilation message (stderr)

teams.cpp: In function 'int main()':
teams.cpp:54:8: warning: unused variable 't' [-Wunused-variable]
    int t = *max_element(a + 1, a + n + 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: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10