답안 #20087

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
20087	2016-02-25T10:47:37 Z	gs14004	괄호 (kriii4_R)	C++14	100 / 100	228 ms	48596 KB

R

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <limits.h>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <algorithm>
#include <string>
#include <functional>
#include <vector>
#include <numeric>
#include <deque>
#include <utility>
#include <bitset>
#include <iostream>
using namespace std;
typedef long long lint;
typedef long double llf;
typedef pair<int, int> pi;
const int mod = 1e9 + 7;

lint fact[2000005];
lint cat[2000005];
lint dp[2000005];

lint ipow(lint x, lint p){
    lint ret = 1, piv = x % mod;
    while(p){
        if(p&1) ret *= piv;
        piv *= piv;
        ret %= mod;
        piv %= mod;
        p >>= 1;
    }
    return ret;
}
 
int main(){
	int n, k;
	cin >> n >> k;
	fact[0] = 1;
	for(int i=1; i<=n; i++){
		fact[i] = fact[i-1] * i % mod;
	}
	for(int i=0; i<=n/2; i++){
		cat[i] = fact[2*i] * ipow(fact[i+1] * fact[i], mod - 2) % mod;
	}
	dp[0] = 1;
	for(int i=1; i<=n; i++){
		if(i%2 == 0){
			dp[i] = dp[i-1] * (k+1) % mod;
		}
		else{
			dp[i] = dp[i-1] * (k+1) % mod - cat[i/2] * ipow(k, i/2) % mod + mod;
			dp[i] %= mod;
		}
	}
	cout << dp[n];
}

Subtask #1

8.0 / 8.0

#	결과	실행 시간	메모리	Grader output
1	Correct	60 ms	48596 KB	Output is correct
2	Correct	14 ms	48596 KB	Output is correct
3	Correct	167 ms	48596 KB	Output is correct
4	Correct	184 ms	48596 KB	Output is correct
5	Correct	186 ms	48596 KB	Output is correct
6	Correct	105 ms	48596 KB	Output is correct
7	Correct	118 ms	48596 KB	Output is correct
8	Correct	78 ms	48596 KB	Output is correct
9	Correct	29 ms	48596 KB	Output is correct
10	Correct	8 ms	48596 KB	Output is correct
11	Correct	9 ms	48596 KB	Output is correct
12	Correct	167 ms	48596 KB	Output is correct
13	Correct	161 ms	48596 KB	Output is correct
14	Correct	69 ms	48596 KB	Output is correct
15	Correct	74 ms	48596 KB	Output is correct
16	Correct	67 ms	48596 KB	Output is correct
17	Correct	205 ms	48596 KB	Output is correct
18	Correct	215 ms	48596 KB	Output is correct
19	Correct	227 ms	48596 KB	Output is correct
20	Correct	228 ms	48596 KB	Output is correct

Subtask #2

92.0 / 92.0

#	결과	실행 시간	메모리	Grader output
1	Correct	57 ms	48596 KB	Output is correct
2	Correct	16 ms	48596 KB	Output is correct
3	Correct	37 ms	48596 KB	Output is correct
4	Correct	198 ms	48596 KB	Output is correct
5	Correct	124 ms	48596 KB	Output is correct
6	Correct	147 ms	48596 KB	Output is correct
7	Correct	108 ms	48596 KB	Output is correct
8	Correct	57 ms	48596 KB	Output is correct
9	Correct	99 ms	48596 KB	Output is correct
10	Correct	14 ms	48596 KB	Output is correct
11	Correct	175 ms	48596 KB	Output is correct
12	Correct	175 ms	48596 KB	Output is correct
13	Correct	174 ms	48596 KB	Output is correct
14	Correct	83 ms	48596 KB	Output is correct
15	Correct	102 ms	48596 KB	Output is correct
16	Correct	103 ms	48596 KB	Output is correct
17	Correct	13 ms	48596 KB	Output is correct
18	Correct	224 ms	48596 KB	Output is correct
19	Correct	224 ms	48596 KB	Output is correct
20	Correct	227 ms	48596 KB	Output is correct