Submission #441992

#	Time	Username	Problem	Language	Result	Execution time	Memory
441992		BeanZ	Calvinball championship (CEOI15_teams)	C++14	100 / 100	772 ms	676 KiB

teams

// I_Love_LPL 11m
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define endl '\n'
const int N = 3e5 + 5;
long long mod = 1000007;
const int lim = 4e5 + 5;
const int lg = 22;
const int base = 311;
const long double eps = 1e-6;
ll a[N], dp[N], mx[N], mem[N];
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    if (fopen("tests.inp", "r")){
        freopen("test.inp", "r", stdin);
        freopen("test.out", "w", stdout);
    }
    ll n;
    cin >> n;
    for (int i = 1; i <= n; i++){
        cin >> a[i];
        mx[i] = max(mx[i - 1], a[i]);
        dp[i] = i;
    }
    ll ans = 0;
    ans = (a[n] - 1) % mod;
    for (int i = (n - 1); i >= 1; i--){
        for (int j = 1; j <= n; j++){
            mem[j] = dp[j];
        }
        for (int j = 1; j <= n; j++){
            dp[j] = ((j - 1) * mem[j] + mem[j + 1]) % mod;
            //cout << mem[j] << " ";
        }
        //cout << endl;
        ans = (ans + (a[i] - 1) * mem[mx[i - 1] + 1]) % mod;
    }
    cout << ans + 1;
}
/*
Ans:

Out:
*/

Compilation message (stderr)

teams.cpp: In function 'int main()':
teams.cpp:17:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |         freopen("test.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
teams.cpp:18:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |         freopen("test.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• 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