Submission #529296

#	Time	Username	Problem	Language	Result	Execution time	Memory
529296		radal	Calvinball championship (CEOI15_teams)	C++14	100 / 100	426 ms	496 KiB

teams

#include <bits/stdc++.h>
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#pragma GCC optimize("unroll-loops")
#define rep(i,l,r) for (int i = l; i < r; i++)
#define repr(i,r,l) for (int i = r; i >= l; i--)
#define X first
#define Y second
#define pb push_back
#define endl '\n'
#define debug(x) cerr << #x << " : " << x << endl;
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pll;
constexpr int N = 1e4+20,mod = 1e6+7,inf = 1e9+10;
inline int mkay(int a,int b){
    if (a+b >= mod) return a+b-mod;
    if (a+b < 0) return a+b+mod;
    return a+b;
}

inline int poww(int a,int k){
    if (k < 0) return 0;
    int z = 1;
    while (k){
        if (k&1) z = 1ll*z*a%mod;
        a = 1ll*a*a%mod;
        k >>= 1;
    }
    return z;
}
int a[N],mx[N];
int dp[2][N],n;
int main(){
    ios :: sync_with_stdio(0); cin.tie(0);
    cin >> n;
    rep(i,1,n+1){
        cin >> a[i];
        mx[i] = max(mx[i-1],a[i]);
    }
    int ans = 1;
    bool f = (n&1);
    f = 1-f;
    rep(j,0,n+1){
        dp[f][j] = 1;
    }
    repr(i,n,1){
        int d = (i&1);
        int g = 1ll*(a[i]-1)*dp[1-d][mx[i-1]]%mod;
        ans = mkay(ans,g);
        rep(j,0,i+1){
            dp[d][j] = mkay(dp[1-d][j+1],1ll*dp[1-d][j]*j%mod);
        }
    }
    cout << ans;
}

• 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