oj.uz

답안 #270587

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
270587 2020-08-17T18:57:51 Z MarcoMeijer Calvinball championship (CEOI15_teams) C++14
20 / 100
 33 ms 19832 KB 
#include <bits/stdc++.h>
using namespace std;

// macros
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef pair<ll, ll> lll;
typedef tuple<int, int, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<iii> viii;
typedef vector<ll> vll;
typedef vector<lll> vlll;
#define REP(a,b,c) for(int a=int(b); a<int(c); a++)
#define RE(a,c) REP(a,0,c)
#define RE1(a,c) REP(a,1,c+1)
#define REI(a,b,c) REP(a,b,c+1)
#define REV(a,b,c) for(int a=int(c-1); a>=int(b); a--)
#define FOR(a,b) for(auto& a : b)
#define all(a) a.begin(), a.end()
#define INF 1e9
#define EPS 1e-9
#define pb push_back
#define popb pop_back
#define fi first
#define se second
#define sz size()
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

// input
template<class T> void IN(T& x) {cin >> x;}
template<class H, class... T> void IN(H& h, T&... t) {IN(h); IN(t...); }

// output
template<class T1, class T2> void OUT(const pair<T1,T2>& x);
template<class T> void OUT(const T& x) {cout << x;}
template<class H, class... T> void OUT(const H& h, const T&... t) {OUT(h); OUT(t...); }
template<class T1, class T2> void OUT(const pair<T1,T2>& x) {OUT(x.fi,' ',x.se);}
template<class... T> void OUTL(const T&... t) {OUT(t..., "\n"); }
template<class H> void OUTLS(const H& h) {OUTL(h); }
template<class H, class... T> void OUTLS(const H& h, const T&... t) {OUT(h,' '); OUTLS(t...); }

//===================//
//  Added libraries  //
//===================//

// mod library
ll MOD=1e9+7;

inline ll mod(ll x_) {
    return (x_)%MOD;
}
ll modpow(ll x_, ll N_) {
    if(N_ == 0) return 1;
    ll a = modpow(x_,N_/2);
    a = (a*a)%MOD;
    if(N_%2) a = (a*x_)%MOD;
    return a;
}
ll inv(ll x_) {
    return modpow(x_, MOD-2);
}
class mi {
public:
    mi(ll v=0) {value = v;}
    mi  operator+ (ll rs) {return mod(value+rs);}
    mi  operator- (ll rs) {return mod(value-rs+MOD);}
    mi  operator* (ll rs) {return mod(value*rs);}
    mi  operator/ (ll rs) {return mod(value*inv(rs));}
    mi& operator+=(ll rs) {*this = (*this)+rs; return *this;}
    mi& operator-=(ll rs) {*this = (*this)-rs; return *this;}
    mi& operator*=(ll rs) {*this = (*this)*rs; return *this;}
    mi& operator/=(ll rs) {*this = (*this)/rs; return *this;}
    operator ll&() {return value;}

    ll value;
};
typedef vector<mi> vmi;

//===================//
//end added libraries//
//===================//

void program();
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    program();
}


//===================//
//   begin program   //
//===================//

const int MX = 1100;

int n;
int a[MX];
int mx[MX];

mi dp[MX][MX];

mi get(int i, int j) { // length i, with j lower options
    if(dp[i][j] != -1) return dp[i][j];

    mi ans = get(i-1, j)*mi(j) + get(i-1,j+1);

    return dp[i][j] = ans;
}

void program() {
    IN(n);
    RE(i,n) IN(a[i]);

    mx[0] = 0;
    RE(i,n) mx[i+1] = max(mx[i], a[i]);

    RE(i,n+2) RE(j,n+2) dp[i][j] = -1;
    RE(j,n+2) dp[0][j] = 1;

    mi ans = 0;
    RE(i,n) {
        int changes = a[i]-1;
        ans += mi(changes)*get(n-i-1,mx[i]);
    }
    ans += 1ll;
    OUTL((ll)ans);
}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 9856 KB Output is correct
2 Correct 5 ms 9856 KB Output is correct
3 Correct 6 ms 9984 KB Output is correct
4 Correct 6 ms 9856 KB Output is correct
5 Correct 7 ms 9856 KB Output is correct
6 Correct 6 ms 9760 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 9856 KB Output is correct
2 Correct 5 ms 9856 KB Output is correct
3 Correct 6 ms 9856 KB Output is correct

Subtask #3
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 6 ms 9856 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 7 ms 9856 KB Output isn't correct

Subtask #5
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 7 ms 9856 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 8 ms 9856 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 19 ms 9856 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 33 ms 19832 KB Execution killed with signal 11

Subtask #9
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 6 ms 9856 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 6 ms 9856 KB Output isn't correct
2 Halted 0 ms 0 KB -