oj.uz

Submission #117825

# Submission time Handle Problem Language Result Execution time Memory
117825 2019-06-17T08:27:37 Z ckodser Boat (APIO16_boat) C++14
27 / 100
 331 ms 4344 KB 
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>
#if __cplusplus >= 201103L
#include <array>
#include <atomic>
#include <chrono>
#include <condition_variable>
#include <forward_list>
#include <future>
#include <initializer_list>
#include <mutex>
#include <random>
#include <ratio>
#include <regex>
#include <scoped_allocator>
#include <system_error>
#include <thread>
#include <tuple>
#include <typeindex>
#include <type_traits>
#include <unordered_map>
#include <unordered_set>
#endif

int gcd(int a, int b) {return b == 0 ? a : gcd(b, a % b);}

#define ll int
#define pb push_back
#define ld long double
#define mp make_pair
#define F first
#define S second
#define pii pair<ll,ll> 

using namespace :: std;

const ll maxn=510;
const ll inf=1e9+800;
const ll mod=1e9+7;

inline void zarb(ll &a,long long  b){a=((long long)a*b)%mod;}
inline ll zarbO(long long a,long long b){return (a*b)%mod;}
inline void jam(ll &a,ll b){a+=b;if(a>=mod)a-=mod;}
inline ll jamO(ll a,ll b){a+=b;if(a>=mod)a-=mod;return a;}

ll dp[maxn][maxn];
ll dppar[maxn][maxn];
ll f[maxn][maxn];
ll ent[maxn][maxn];
ll rev[maxn];
ll a[maxn];
ll b[maxn];

ll poww(ll a,ll b){
	ll ans=1;
	while(b){
		if(b&1){
			zarb(ans,a);
		}
		b>>=1;
		zarb(a,a);
	}
	return ans;
}	


ll tmp[maxn];
void hesab(ll x,ll tol){
	tmp[0]=1;
	for(ll i=1;i<maxn;i++){
		tmp[i]=zarbO(tmp[i-1],zarbO(tol-i+1,rev[i]));
	}
	for(ll t=0;t+1<maxn;t++){
		for(ll i=0;i<=t;i++){
			jam(f[x][t],zarbO(ent[t][i],tmp[i+1]));
		}
	}
}
int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	for(ll i=0;i<maxn;i++){
		rev[i]=poww(i,mod-2);
	}	
	ent[0][0]=1;
	for(ll i=1;i<maxn;i++){
		ent[i][0]=1;
		ent[i][i]=1;
		for(ll j=1;j<i;j++){
			ent[i][j]=jamO(ent[i-1][j],ent[i-1][j-1]);
		}
	}
	ll n;
	cin>>n;
	vector<ll> vec;
	vec.pb(0);
	vec.pb(inf);
	for(ll i=0;i<n;i++){
		cin>>a[i]>>b[i];
		vec.pb(a[i]);
		vec.pb(b[i]+1);
	}
	{
		sort(vec.begin(),vec.end());
		auto it=unique(vec.begin(),vec.end());
		vec.resize(it-vec.begin());
	}
//	for(auto e:vec)cout<<e<<' ';cout<<endl;
	for(ll i=0;i+1<(ll)vec.size();i++){
		ll tol=vec[i+1]-vec[i];
		hesab(i,tol);
	}
	ll ans=0;
	for(ll i=0;i<n;i++){
		for(ll j=0;j+1<(ll)vec.size();j++){
			//dp[i][j];
			if(a[i]<=vec[j] && b[i]+1>=vec[j+1]){
				ll tedad=0;
				for(ll z=i-1;z>=0;z--){
				//	cout<<j<<"^"<<tedad<<":"<<f[j][tedad]<<endl;
					if(j)jam(dp[i][j],zarbO(dppar[z][j-1],f[j][tedad]));
					tedad+=(a[z]<=vec[j] && b[z]+1>=vec[j+1]);	
				}
				jam(dp[i][j],f[j][tedad]);
			}
		}
	//	for(ll j=0;j+1<vec.size();j++)cout<<dp[i][j]<<' ';cout<<endl;
		dppar[i][0]=dp[i][0];
		for(ll j=1;j+1<(ll)vec.size();j++){
			dppar[i][j]=(dppar[i][j-1]+dp[i][j])%mod;
		}
		jam(ans,dppar[i][vec.size()-2]);
	}
	cout<<ans;
}

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 331 ms 4344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Incorrect 331 ms 4344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 71 ms 2176 KB Output is correct
2 Correct 70 ms 2168 KB Output is correct
3 Correct 71 ms 2168 KB Output is correct
4 Correct 72 ms 2168 KB Output is correct
5 Correct 72 ms 2172 KB Output is correct
6 Correct 76 ms 2168 KB Output is correct
7 Correct 76 ms 2168 KB Output is correct
8 Correct 75 ms 2296 KB Output is correct
9 Correct 78 ms 2140 KB Output is correct
10 Correct 74 ms 2296 KB Output is correct
11 Correct 72 ms 2148 KB Output is correct
12 Correct 72 ms 2044 KB Output is correct
13 Correct 71 ms 2168 KB Output is correct
14 Correct 72 ms 2176 KB Output is correct
15 Correct 71 ms 2216 KB Output is correct
16 Correct 45 ms 2168 KB Output is correct
17 Correct 42 ms 2040 KB Output is correct
18 Correct 42 ms 2040 KB Output is correct
19 Correct 46 ms 1988 KB Output is correct
20 Correct 45 ms 2012 KB Output is correct

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Incorrect 331 ms 4344 KB Output isn't correct
2 Halted 0 ms 0 KB -