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Submission #268712

# Submission time Handle Problem Language Result Execution time Memory
268712 2020-08-16T20:08:58 Z test2 Boat (APIO16_boat) C++14
9 / 100
 465 ms 17016 KB 
#include<bits/stdc++.h>

#define I inline void 

using ll = long long ; 
using ld = long double ; 

using namespace std ; 

const int N = 3000 + 7 , mod = 1e9 + 7 ; 

// how interesting!

int n; 

ll ans ; 
map<int , int > used ; 
set<pair<int , int> > st ; 
ll sz[N] ;
vector<pair<int , int> > v ; 
ll f[N] ; 

I add(int u , int v){
	while(u <=v && used[u])u++ ; 
	while(v>=u&&used[v])v-- ; 

	if(u <=v){
		used[u] = used[v] = 1; 
		st.insert({u , v}) ; 
	}
}

vector<int> onepiece[N * 10] ; 
std::vector<int> szs[N * 10];

ll dp[N][505] ; 

ll mul(ll a , ll b){
	return (1ll * a * b) %mod ; 
}

ll faspow(ll x , ll y){
	if(!y)return 1ll ; 
	ll ret = faspow(x , y/2) ; 
	ret = (1ll * ret * ret ) %mod ;
	if(y&1)ret = 1ll * ret * x %mod ; 
	return ret ; 
}

ll ncr(ll x , ll y){
	return 1ll ; 
	ll ret = mul(f[x] , faspow(f[y] , mod -2)) ; 
	ret = mul(ret , faspow(f[x - y] , mod-2)) ; 
}

ll solve(int i , int j){
	if(dp[i][j]!=-1)
		return dp[i][j] ; 
	if(i == (int) st.size())
		return 1; 
	ll ret = solve(i+1 , j ) ; 

	int pos = 0 ;
	ll add = 0ll ; 

	int k = 0 ; 
	for(auto u : onepiece[i]){
		if(u > j){
			if( k +1 <= sz[i])
				add = (add + ncr(sz[i] , min((int) sz[i] , ++ k ) )  )  %mod ; 
			ll plls = mul( add , solve(i+1,  u) ) ; 
			ret = (ret + plls ) %mod  ; 
		}
		pos ++ ; 
	}
	return dp[i][j] = ret ; 
}

ll conts[N] ; 

int main(){	
	ios_base::sync_with_stdio(0) ; 
	cin.tie(0) ; 
	memset(dp , -1 , sizeof dp) ; 

	f[0] = 1ll ; 
	for(int i =1 ; i < N ;i++){
		f[i]= mul(f[i-1] , i) ; 
	}

	//freopen("in.in" , "r" , stdin) ;  
	cin >> n; 
	set<int> ev ; 

	for(int i = 0 ;i < n;i++){
		int x , y ; 
		cin >> x >> y ; 
		ev.insert(x) ; 
		ev.insert(y) ; 
		used[x] = used[y] = 1; 
		st.insert({x , x}) ; 
		st.insert({y , y}) ;
		//for(int j =x ;j <= y ;j ++)
		//	st.push_back({j , j})  ; 
		v.push_back({x , y}) ; 
	}
	
	int l = 0 ; 
	for(auto u : ev){
		if(l){
			add(l+1 , u - 1) ; 
		}
		l = u ; 
	}

	int pos = 0 ; 
	for(auto u : st){ 

		for(int j = 0 ;j < n; j++){
			if(  u.first>= v[j].first &&  u.second <= v[j].second ){
				onepiece[pos].push_back(j + 1) ; 
				szs[pos].push_back( u.second - u.first +1 ) ; 

				sz[pos] += u.second - u.first + 1ll ;
				conts[j] +=  u.second -  u.first + 1 ; 
			}
		}
		sz[pos] = u.second - u.first + 1 ; 
		sort(onepiece[pos].begin() , onepiece[pos].end()) ; 
		pos ++ ; 
	}



	for(int i = 0 ;i < n;i++){
	//	assert((conts[i] == v[i].second - v[i].first + 1)) ; 
	}
		
	cout<< (mod + solve(0 ,  0 ) -1 ) %mod ; 
	return 0 ; 
}

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 13952 KB Output is correct
2 Correct 15 ms 13952 KB Output is correct
3 Correct 15 ms 13952 KB Output is correct
4 Correct 14 ms 13952 KB Output is correct
5 Correct 14 ms 13952 KB Output is correct
6 Correct 15 ms 13952 KB Output is correct
7 Correct 15 ms 13952 KB Output is correct
8 Correct 16 ms 14092 KB Output is correct
9 Correct 15 ms 13952 KB Output is correct
10 Correct 15 ms 13952 KB Output is correct
11 Correct 15 ms 13952 KB Output is correct
12 Correct 15 ms 13952 KB Output is correct
13 Correct 16 ms 13952 KB Output is correct
14 Correct 16 ms 13952 KB Output is correct
15 Correct 15 ms 13952 KB Output is correct
16 Correct 10 ms 13696 KB Output is correct
17 Correct 10 ms 13696 KB Output is correct
18 Correct 11 ms 13696 KB Output is correct
19 Correct 10 ms 13696 KB Output is correct
20 Correct 10 ms 13696 KB Output is correct

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 13952 KB Output is correct
2 Correct 15 ms 13952 KB Output is correct
3 Correct 15 ms 13952 KB Output is correct
4 Correct 14 ms 13952 KB Output is correct
5 Correct 14 ms 13952 KB Output is correct
6 Correct 15 ms 13952 KB Output is correct
7 Correct 15 ms 13952 KB Output is correct
8 Correct 16 ms 14092 KB Output is correct
9 Correct 15 ms 13952 KB Output is correct
10 Correct 15 ms 13952 KB Output is correct
11 Correct 15 ms 13952 KB Output is correct
12 Correct 15 ms 13952 KB Output is correct
13 Correct 16 ms 13952 KB Output is correct
14 Correct 16 ms 13952 KB Output is correct
15 Correct 15 ms 13952 KB Output is correct
16 Correct 10 ms 13696 KB Output is correct
17 Correct 10 ms 13696 KB Output is correct
18 Correct 11 ms 13696 KB Output is correct
19 Correct 10 ms 13696 KB Output is correct
20 Correct 10 ms 13696 KB Output is correct
21 Incorrect 465 ms 17016 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Incorrect 14 ms 13952 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 13952 KB Output is correct
2 Correct 15 ms 13952 KB Output is correct
3 Correct 15 ms 13952 KB Output is correct
4 Correct 14 ms 13952 KB Output is correct
5 Correct 14 ms 13952 KB Output is correct
6 Correct 15 ms 13952 KB Output is correct
7 Correct 15 ms 13952 KB Output is correct
8 Correct 16 ms 14092 KB Output is correct
9 Correct 15 ms 13952 KB Output is correct
10 Correct 15 ms 13952 KB Output is correct
11 Correct 15 ms 13952 KB Output is correct
12 Correct 15 ms 13952 KB Output is correct
13 Correct 16 ms 13952 KB Output is correct
14 Correct 16 ms 13952 KB Output is correct
15 Correct 15 ms 13952 KB Output is correct
16 Correct 10 ms 13696 KB Output is correct
17 Correct 10 ms 13696 KB Output is correct
18 Correct 11 ms 13696 KB Output is correct
19 Correct 10 ms 13696 KB Output is correct
20 Correct 10 ms 13696 KB Output is correct
21 Incorrect 465 ms 17016 KB Output isn't correct
22 Halted 0 ms 0 KB -