Submission #364801

#	Time	Username	Problem	Language	Result	Execution time	Memory
364801		knightron0	Calvinball championship (CEOI15_teams)	C++14	100 / 100	837 ms	748 KiB

teams

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

#define pb push_back
#define fr first
#define sc second
#define clr(a, x) memset(a, x, sizeof(a))
#define dbg(x) cout<<"("<<#x<<"): "<<x<<endl;
#define printvector(arr) for (auto it = arr.begin(); it != arr.end(); ++it) cout<<*it<<" "; cout<<endl;
#define all(v) v.begin(), v.end()
#define lcm(a, b) (a * b)/__gcd(a, b)
#define int long long int
#define printvecpairs(vec) for(auto it: vec) cout<<it.fr<<' '<<it.sc<<endl;
#define endl '\n'
#define float long double

const int MOD = 1e6 + 7;
const int INF = 2e15;
const int MAXN = 1e5 + 5;

int fastexpo(int b, int exp){
    if(exp == 0) return 1;
    if(exp == 1) return b;
    int ans = (fastexpo(b,exp/2) % MOD);
    ans *= ans;
    ans %= MOD;
    if(exp % 2 == 1){
        ans *= b;
    }
    ans %= MOD;
    return ans;
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    #ifdef LOCAL
    freopen("input.txt", "r", stdin);
    #endif
    int n;
    cin>>n;
    int a[n+1];
    int prefmx[n+2];
    prefmx[0] = 0;
    for(int i=1;i<=n;i++){
    	cin>>a[i];
        prefmx[i] = prefmx[i-1];
        prefmx[i] = max(prefmx[i], a[i]);
    }
    int dp[2][n+2];
    for(int j=1;j<=n;j++) dp[0][j]= 1;
    int ans = a[n]%MOD;
    for(int i= 1;i<n;i++){
        int par = (i%2);
        for(int j= 1;j<=n;j++){
            dp[par][j] = (((dp[par^1][j]%MOD)*(j%MOD))%MOD + (dp[par^1][j+1]%MOD))%MOD;
        }
        ans +=((dp[par][prefmx[n-i-1]]%MOD)*(a[n-i]-1+MOD)%MOD)%MOD;
        ans %= MOD;
    }
    cout<<ans%MOD<<endl;
    return 0;
}

• 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