답안 #19940

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
19940	2016-02-25T07:30:10 Z	emppu	괄호 (kriii4_R)	C++14	100 / 100	89 ms	21252 KB

R

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cstring>
#include <cassert>

#include <algorithm>
#include <vector>
#include <string>
#include <set>
#include <map>
#include <queue>
#include <deque>
#include <list>
#include <bitset>
#include <tuple>

using namespace std;

#define f0(_X,_Y) for(int (_X)=0;(_X)<(_Y);++(_X))
#define f1(_X,_Y) for(int (_X)=1;(_X)<=(_Y);++(_X))
#define ff(_X,_Y,_Z) for(int (_X)=(_Y);(_X)<=(_Z);++(_X))
#define fF(_X,_Y,_Z) for(int (_X)=(_Y);(_X)<(_Z);++(_X))
#define rf0(_X,_Y) for(int _X=(_Y)-1;(_X)>=0;--(_X))
#define rf1(_X,_Y) for(int _X=(_Y);(_X)>0;--(_X))
#define rff(_X,_Y,_Z) for(int _X=(_Y);(_X)>=(_Z);--(_X))
#define rfF(_X,_Y,_Z) for(int _X=(_Y);(_X)>(_Z);--(_X))
#define PRT(_X) std::cout<< #_X ": "<<_X<<std::endl;

#define scan1(_X) scanf("%d",&_X);
#define scan2(_X,_Y) scanf("%d%d",&_X,&_Y);
#define scan3(_X,_Y,_Z) scanf("%d%d%d",&_X,&_Y,&_Z);
#define define1(_1) int _1; scan1(_1)
#define define2(_1,_2) int _1,_2; scan2(_1,_2)
#define define3(_1,_2,_3) int _1,_2,_3; scan3(_1,_2,_3)
#define EXPAND(_1) _1
#define SELECT(_1,_2,_3,_4,NAME,...) NAME
#define scan(...) EXPAND(SELECT(__VA_ARGS__, scan4, scan3, scan2, scan1)(__VA_ARGS__))
#define define(...) EXPAND(SELECT(__VA_ARGS__, define4, define3, define2, define1)(__VA_ARGS__))
#define print(_X) printf("%d\n",_X)
#define PAIR_STRUCT(_T,_X,_Y,...) struct _T{int _X,_Y,##__VA_ARGS__; bool friend operator < (const _T &p, const _T &q){if(p._X!=q._X) return p._X<q._X; return p._Y<q._Y;}}

typedef long long ll;

const int MOD = 1000000007;
ll mul(ll a, ll b){return a*b%MOD;}
ll add(ll a, ll b){return (a+b)%MOD;}

ll inv(ll a, ll b=MOD)
{
	ll s = 0;  ll  old_s = 1;
	ll r = b;  ll  old_r = a;
	while (r!=0)
	{
		ll quotient = old_r / r;
		tie(old_r, r) = make_tuple(r, old_r - quotient * r);
		tie(old_s, s) = make_tuple(s, old_s - quotient * s);
	}
	ll inv = old_s%MOD;
	if(inv<0) inv += MOD;
	return inv;
}

const int N = 1000006;
ll s[N],in[N];
int dv[N];

int main()
{
	define(n,color);

	// divisors
	ff(i,2,n+1)
	{
		for(int j=i;j<=n+1;j+=i) if(!dv[j]) dv[j]=i;
	}
	// inverse
	in[1]=1;
	ff(i,2,n+1)
	{
		if(dv[i]!=i)
			in[i]=  mul(in[dv[i]],in[i/dv[i]]);
		else
			in[i]= inv(i);
	}

	s[0]=1;
	ll power = 1;
	ll cat = 1;
	f1(i,n)
	{
		ll but = 0;
		if((i-1)%2==0)
		{
			if(i>=3)
			{
				ll half = (i-1)/2; // we need catalan[half]
				cat = mul(cat,mul(mul(mul(i-1,i-2),in[half]),in[half]));
			}
			but = mul(power,mul(cat*2,in[i+1])); // catalan (i-1)/2
			// PRT(but);
			power = mul(power,color);
		}
		s[i]=add(mul(s[i-1],color+1),(MOD-but));

	}
	printf("%lld\n",s[n]);
	return 0;
}

Subtask #1

8.0 / 8.0

#	결과	실행 시간	메모리	Grader output
1	Correct	24 ms	21252 KB	Output is correct
2	Correct	0 ms	21252 KB	Output is correct
3	Correct	67 ms	21252 KB	Output is correct
4	Correct	74 ms	21252 KB	Output is correct
5	Correct	65 ms	21252 KB	Output is correct
6	Correct	42 ms	21252 KB	Output is correct
7	Correct	39 ms	21252 KB	Output is correct
8	Correct	32 ms	21252 KB	Output is correct
9	Correct	13 ms	21252 KB	Output is correct
10	Correct	0 ms	21252 KB	Output is correct
11	Correct	0 ms	21252 KB	Output is correct
12	Correct	60 ms	21252 KB	Output is correct
13	Correct	64 ms	21252 KB	Output is correct
14	Correct	28 ms	21252 KB	Output is correct
15	Correct	30 ms	21252 KB	Output is correct
16	Correct	28 ms	21252 KB	Output is correct
17	Correct	79 ms	21252 KB	Output is correct
18	Correct	78 ms	21252 KB	Output is correct
19	Correct	87 ms	21252 KB	Output is correct
20	Correct	87 ms	21252 KB	Output is correct

Subtask #2

92.0 / 92.0

#	결과	실행 시간	메모리	Grader output
1	Correct	21 ms	21252 KB	Output is correct
2	Correct	8 ms	21252 KB	Output is correct
3	Correct	17 ms	21252 KB	Output is correct
4	Correct	82 ms	21252 KB	Output is correct
5	Correct	47 ms	21252 KB	Output is correct
6	Correct	56 ms	21252 KB	Output is correct
7	Correct	44 ms	21252 KB	Output is correct
8	Correct	25 ms	21252 KB	Output is correct
9	Correct	43 ms	21252 KB	Output is correct
10	Correct	6 ms	21252 KB	Output is correct
11	Correct	72 ms	21252 KB	Output is correct
12	Correct	74 ms	21252 KB	Output is correct
13	Correct	71 ms	21252 KB	Output is correct
14	Correct	33 ms	21252 KB	Output is correct
15	Correct	41 ms	21252 KB	Output is correct
16	Correct	41 ms	21252 KB	Output is correct
17	Correct	6 ms	21252 KB	Output is correct
18	Correct	87 ms	21252 KB	Output is correct
19	Correct	89 ms	21252 KB	Output is correct
20	Correct	89 ms	21252 KB	Output is correct