Submission #268669

#	Time	Username	Problem	Language	Result	Execution time	Memory
268669		test2	Boat (APIO16_boat)	C++14	0 / 100	2 ms	512 KiB

boat

#include<bits/stdc++.h>

#define I inline void 

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

using namespace std ; 

const int N = 1e4 + 7 , mod = 1e9 + 7 ; 

// how interesting!

int n; 
ll dp[N] ; 
ll ans = 0 ; 

int main(){	
	ios_base::sync_with_stdio(0) ; 
	cin.tie(0) ; 
	//freopen("in.in" , "r" , stdin) ;  

	cin >> n ; 

	dp[0] = 1ll ; 
	for(int i = 0 ;i < n ; i++){
		ll x , y  ; 
		cin >> x >> y ; 
		map<ll , ll> mp ; 
		for(int j = x ;j <= y ;j ++){
			for(int k = 0 ; k < j ; k++){
				mp[j] += dp[k] ; 
				mp[j]%=mod ; 
			}
		}
		for(auto u : mp){
			dp[u.first]+=u.second ; 
			dp[u.first]%= mod ; 
		}
	}
	for(int i = 0 ;i < N ;i++){
		ans = (ans + dp[i]) %mod ; 
	}

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

• Subtask 1: 0 / 9
• Subtask 2: 0 / 22
• Subtask 3: 0 / 27
• Subtask 4: 0 / 42