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Submission #268698

# Submission time Handle Problem Language Result Execution time Memory
268698 2020-08-16T18:47:21 Z test2 Boat (APIO16_boat) C++14
9 / 100
 609 ms 33664 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 ; 
vector<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){
		st.push_back({u , v}) ; 
	}
}

vector<int> onepiece[N] ; 

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 ) ; 

	for(auto u : onepiece[i]){
		if(u > j){
			ll add = mul(st[i].second - st[i].first +1ll , solve(i+1,  u) ) ; 
			ret = (ret + add) %mod  ; 
		}
	}
	return dp[i][j] = ret ; 
}


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

	//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.push_back({x , x}) ; 
		st.push_back({y , y}) ;
		v.push_back({x , y}) ; 
	}
	
	int l = 0 ; 
	for(auto u : ev){
		if(l){
			add(l+1 , u - 1) ; 
		}
		l = u ; 
	}

	sort(st.begin() , st.end()) ; 
	st.resize( unique(st.begin() , st.end()) - st.begin()) ; 

	for(int i = 0 ;i < (int) st.size() ; i++){
		for(int j = 0 ;j < n; j++){
			if( st[i].first>= v[j].first && st[i].second <= v[j].second ){
				onepiece[i].push_back(j + 1) ; 
			}
		}
	}
	
	for(int i = 1 ;i < (int) st.size() ;i ++){
		assert( st[i].first > st[i-1].second ) ; 
		assert(st[i].first <= st[i].second) ; 
	}

	cout<< (mod + solve(0 ,  0 ) -1 ) %mod ; 
	return 0 ; 
}

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 32128 KB Output is correct
2 Correct 25 ms 32128 KB Output is correct
3 Correct 25 ms 32128 KB Output is correct
4 Correct 25 ms 32128 KB Output is correct
5 Correct 25 ms 32128 KB Output is correct
6 Correct 25 ms 32120 KB Output is correct
7 Correct 27 ms 32256 KB Output is correct
8 Correct 24 ms 32128 KB Output is correct
9 Correct 25 ms 32128 KB Output is correct
10 Correct 25 ms 32128 KB Output is correct
11 Correct 25 ms 32128 KB Output is correct
12 Correct 25 ms 32128 KB Output is correct
13 Correct 24 ms 32128 KB Output is correct
14 Correct 25 ms 32128 KB Output is correct
15 Correct 29 ms 32128 KB Output is correct
16 Correct 22 ms 32000 KB Output is correct
17 Correct 22 ms 31960 KB Output is correct
18 Correct 20 ms 32000 KB Output is correct
19 Correct 20 ms 32000 KB Output is correct
20 Correct 20 ms 32000 KB Output is correct

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 32128 KB Output is correct
2 Correct 25 ms 32128 KB Output is correct
3 Correct 25 ms 32128 KB Output is correct
4 Correct 25 ms 32128 KB Output is correct
5 Correct 25 ms 32128 KB Output is correct
6 Correct 25 ms 32120 KB Output is correct
7 Correct 27 ms 32256 KB Output is correct
8 Correct 24 ms 32128 KB Output is correct
9 Correct 25 ms 32128 KB Output is correct
10 Correct 25 ms 32128 KB Output is correct
11 Correct 25 ms 32128 KB Output is correct
12 Correct 25 ms 32128 KB Output is correct
13 Correct 24 ms 32128 KB Output is correct
14 Correct 25 ms 32128 KB Output is correct
15 Correct 29 ms 32128 KB Output is correct
16 Correct 22 ms 32000 KB Output is correct
17 Correct 22 ms 31960 KB Output is correct
18 Correct 20 ms 32000 KB Output is correct
19 Correct 20 ms 32000 KB Output is correct
20 Correct 20 ms 32000 KB Output is correct
21 Incorrect 609 ms 33664 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Incorrect 23 ms 32128 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 32128 KB Output is correct
2 Correct 25 ms 32128 KB Output is correct
3 Correct 25 ms 32128 KB Output is correct
4 Correct 25 ms 32128 KB Output is correct
5 Correct 25 ms 32128 KB Output is correct
6 Correct 25 ms 32120 KB Output is correct
7 Correct 27 ms 32256 KB Output is correct
8 Correct 24 ms 32128 KB Output is correct
9 Correct 25 ms 32128 KB Output is correct
10 Correct 25 ms 32128 KB Output is correct
11 Correct 25 ms 32128 KB Output is correct
12 Correct 25 ms 32128 KB Output is correct
13 Correct 24 ms 32128 KB Output is correct
14 Correct 25 ms 32128 KB Output is correct
15 Correct 29 ms 32128 KB Output is correct
16 Correct 22 ms 32000 KB Output is correct
17 Correct 22 ms 31960 KB Output is correct
18 Correct 20 ms 32000 KB Output is correct
19 Correct 20 ms 32000 KB Output is correct
20 Correct 20 ms 32000 KB Output is correct
21 Incorrect 609 ms 33664 KB Output isn't correct
22 Halted 0 ms 0 KB -