Submission #107328

#	Time	Username	Problem	Language	Result	Execution time	Memory
107328		username	Boat (APIO16_boat)	C++14	9 / 100	2040 ms	384 KiB

boat

#include<bits/stdc++.h>
#include<stdint.h>
#define int int64_t
using namespace std;
typedef pair<int,int> pii;
#define REP(i,j,k) for(int i=(j);i<(k);++i)
#define RREP(i,j,k) for(int i=(j)-1;i>=(k);--i)
#define MST(a,v) memset(a,(v),sizeof a)
#define F first
#define S second
#define IOS cin.tie(0),ios_base::sync_with_stdio(false)
#define add(x,y) x=(x+y)%mo

const int maxn=509,mo=1e9L+7;
int n,q=0,a[maxn],b[maxn],dp[maxn];
pii p[2*maxn];

int qp(int x,int t){
	int re=1;
	while(t){
		if(t&1)re=re*x%mo;
		x=x*x%mo,t>>=1;
	}
	return re;
}

main(){
	IOS;
	cin>>n;
	REP(i,0,n)cin>>a[i]>>b[i],++b[i],p[q++]=pii(a[i],0),p[q++]=pii(b[i],0);
	sort(p,p+q);
	q=unique(p,p+q)-p;
	REP(i,0,q)p[i].S=i;
	REP(i,0,n)a[i]=lower_bound(p,p+q,pii(a[i],0))->S,b[i]=lower_bound(p,p+q,pii(b[i],0))->S;
	dp[0]=1;
	REP(i,0,q-1){
		RREP(j,n,0){
			int l=p[i+1].F-p[i].F;
			if(a[j]<=i&&i<b[j]){
				int c=l,t=1;
				RREP(k,j+1,0){
					add(dp[j+1],dp[k]*c%mo);
					if(k&&a[k-1]<=i&&i<b[k-1])c=c*(k+l)%mo*qp(k+1,mo-2)%mo,++t;
				}
			}
		}
	}
	int sum=0;
	REP(i,0,n)add(sum,dp[i+1]);
	cout<<sum<<endl;
}

Compilation message (stderr)

boat.cpp:27:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^

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