제출 #871535

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
871535		UmairAhmadMirza	캥거루 (CEOI16_kangaroo)	C++14	6 / 100	2 ms	3420 KiB

kangaroo

//In the name of Allah the most beneficent, the most merciful.
#include <bits/stdc++.h>

using namespace std;

// #pragma GCC optimize("Ofast,unroll-loops") 
// #pragma GCC target("avx,avx2,avx512,fma") 
#define int long long
#define ar array
#define ll long long
#define ld long double
#define sza(x) ((int)x.size())
#define all(a) (a).begin(), (a).end()

#define PI 3.1415926535897932384626433832795l 
const int N = 205;
const ll mod = 1e9 + 7;
const ll INF = 1e9;
const ld EPS = 1e-9;

// -------------------------<RNG>------------------------- 
// RANDOM NUMBER GENERATOR
mt19937 RNG(chrono::steady_clock::now().time_since_epoch().count());  
#define SHUF(v) shuffle(all(v), RNG); 
// Use mt19937_64 for 64 bit random numbers.
//--------------------------------------------------------
//int defined as long long
int dp[N][N][N][2];
void solve() {
    int n,cs,cf;
    cin>>n>>cs>>cf;
    dp[2][1][2][1]=1;
    dp[2][2][1][0]=1;
    for(int sz=3;sz<=n;sz++)
    	for(int st=1;st<=sz;st++)
    		for(int ed=1;ed<=sz;ed++){
    			if(st==ed)
    				continue;
    			// cout<<sz<<' '<<st<<' '<<ed<<endl;
    			//di==1
    			for(int nxt=st;nxt<sz;nxt++){
    				dp[sz][st][ed][1]+=dp[sz-1][nxt][ed-(st<ed)][0];
    				// dp[sz][st][ed][1]%=mod;
    			}
    			//di==0
    			for(int nxt=1;nxt<st;nxt++){
    				dp[sz][st][ed][0]+=dp[sz-1][nxt][ed-(st<ed)][1];
    				// dp[sz][st][ed][0]%=mod;
    			}
    			// cout<<dp[sz][st][ed][0]<<' '<<dp[sz][st][ed][1]<<endl;
    			// return;
    		}
    cout<<(dp[n][cs][cf][0]+dp[n][cf][cs][1])%mod<<endl;
}

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    // freopen("billboard.in", "r", stdin);
	// freopen("billboard.out", "w", stdout);
    int tc = 1;
    // cin >> tc;
    for (int t = 1; t <= tc; t++) {
        // cout << "Case #" << t << ": ";
        solve();
    }
}

• Subtask 1: 6 / 6
• Subtask 2: 0 / 30
• Subtask 3: 0 / 15
• Subtask 4: 0 / 49