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Submission #268707

# Submission time Handle Problem Language Result Execution time Memory
268707 2020-08-16T19:22:51 Z test2 Boat (APIO16_boat) C++14
9 / 100
 495 ms 36208 KB 
#include<bits/stdc++.h>

#define I inline void 

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

using namespace std ; 

const int N = 2000 + 7 , mod = 1e9 + 7 ; 

// how interesting!

int n; 

ll ans ; 
map<int , int > used ; 
set<pair<int , int> > st ; 
vector<pair<int , int> > v ; 

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][N] ; 

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

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 ;
	for(auto u : onepiece[i]){
		if(u > j){
			ll add = mul( szs[i][pos] , solve(i+1,  u) ) ; 
			ret = (ret + add) %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) ; 
	srand(time(0)) ; 
	//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 ) ; 
				conts[j] +=  u.second -  u.first + 1 ; 
			}
		}
		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 30 ms 33024 KB Output is correct
2 Correct 34 ms 33024 KB Output is correct
3 Correct 35 ms 33024 KB Output is correct
4 Correct 33 ms 33024 KB Output is correct
5 Correct 35 ms 33112 KB Output is correct
6 Correct 29 ms 33056 KB Output is correct
7 Correct 30 ms 33024 KB Output is correct
8 Correct 33 ms 33024 KB Output is correct
9 Correct 30 ms 33024 KB Output is correct
10 Correct 34 ms 33024 KB Output is correct
11 Correct 29 ms 33024 KB Output is correct
12 Correct 29 ms 33024 KB Output is correct
13 Correct 29 ms 33024 KB Output is correct
14 Correct 28 ms 33024 KB Output is correct
15 Correct 29 ms 33024 KB Output is correct
16 Correct 23 ms 32896 KB Output is correct
17 Correct 23 ms 32892 KB Output is correct
18 Correct 23 ms 32892 KB Output is correct
19 Correct 23 ms 32888 KB Output is correct
20 Correct 23 ms 32896 KB Output is correct

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 30 ms 33024 KB Output is correct
2 Correct 34 ms 33024 KB Output is correct
3 Correct 35 ms 33024 KB Output is correct
4 Correct 33 ms 33024 KB Output is correct
5 Correct 35 ms 33112 KB Output is correct
6 Correct 29 ms 33056 KB Output is correct
7 Correct 30 ms 33024 KB Output is correct
8 Correct 33 ms 33024 KB Output is correct
9 Correct 30 ms 33024 KB Output is correct
10 Correct 34 ms 33024 KB Output is correct
11 Correct 29 ms 33024 KB Output is correct
12 Correct 29 ms 33024 KB Output is correct
13 Correct 29 ms 33024 KB Output is correct
14 Correct 28 ms 33024 KB Output is correct
15 Correct 29 ms 33024 KB Output is correct
16 Correct 23 ms 32896 KB Output is correct
17 Correct 23 ms 32892 KB Output is correct
18 Correct 23 ms 32892 KB Output is correct
19 Correct 23 ms 32888 KB Output is correct
20 Correct 23 ms 32896 KB Output is correct
21 Incorrect 495 ms 36208 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Incorrect 26 ms 33024 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 30 ms 33024 KB Output is correct
2 Correct 34 ms 33024 KB Output is correct
3 Correct 35 ms 33024 KB Output is correct
4 Correct 33 ms 33024 KB Output is correct
5 Correct 35 ms 33112 KB Output is correct
6 Correct 29 ms 33056 KB Output is correct
7 Correct 30 ms 33024 KB Output is correct
8 Correct 33 ms 33024 KB Output is correct
9 Correct 30 ms 33024 KB Output is correct
10 Correct 34 ms 33024 KB Output is correct
11 Correct 29 ms 33024 KB Output is correct
12 Correct 29 ms 33024 KB Output is correct
13 Correct 29 ms 33024 KB Output is correct
14 Correct 28 ms 33024 KB Output is correct
15 Correct 29 ms 33024 KB Output is correct
16 Correct 23 ms 32896 KB Output is correct
17 Correct 23 ms 32892 KB Output is correct
18 Correct 23 ms 32892 KB Output is correct
19 Correct 23 ms 32888 KB Output is correct
20 Correct 23 ms 32896 KB Output is correct
21 Incorrect 495 ms 36208 KB Output isn't correct
22 Halted 0 ms 0 KB -