Submission #987819

#	Time	Username	Problem	Language	Result	Execution time	Memory
987819		LOLOLO	Kangaroo (CEOI16_kangaroo)	C++17	0 / 100	2 ms	4444 KiB

kangaroo

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define           f     first
#define           s     second
#define           pb    push_back
#define           ep    emplace
#define           eb    emplace_back
#define           lb    lower_bound
#define           ub    upper_bound
#define       all(x)    x.begin(), x.end()
#define      rall(x)    x.rbegin(), x.rend()
#define   uniquev(v)    sort(all(v)), (v).resize(unique(all(v)) - (v).begin())
#define     mem(f,x)    memset(f , x , sizeof(f))
#define        sz(x)    (int)(x).size()
#define  __lcm(a, b)    (1ll * ((a) / __gcd((a), (b))) * (b))
#define          mxx    *max_element
#define          mnn    *min_element
#define    cntbit(x)    __builtin_popcountll(x)
#define       len(x)    (int)(x.length())
 
const int N = 210;
ll mod = 1e9 + 7;
int A[N][N][N], D[N][N][N];

void add(int &a, int b) { 
    a += b;
    while (a >= mod)
        a -= mod;
}  

int solve() {
    int n, cs, cf;
    cin >> n >> cs >> cf;

    A[2][1][2] = D[2][2][1] = 1;
    for (int len = 3; len <= n; len++) {
        for (int i = 1; i <= len; i++) {
            for (int j = 1; j <= len; j++) {
                for (int k = 1; k < i; k++) {
                    add(D[len][i][j], A[len - 1][k][j - bool(j > i)]);
                }

                for (int k = i + 1; k <= len; k++) {
                    add(A[len][i][j], D[len - 1][k][j - bool(j > i)]);
                }
            }
        }
    }

    return (A[n][cs][cf] + D[n][cs][cf]) % mod;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int t = 1;
    //cin >> t;

    while (t--) {
        cout << solve() << '\n';
    }

    return 0;
}

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