Submission #1147602

#	Time	Username	Problem	Language	Result	Execution time	Memory
1147602		raspy	Kangaroo (CEOI16_kangaroo)	C++20	Compilation error	0 ms	0 KiB

kangaroo

#include <bits/stdc++.h>

#define int long long
#define vi vector<int>
#define ii pair<int, int>
#define f first
#define s second
#define all(x) (x).begin(), (x).end()
#define P 31
#define mod 1'000'000'007
#define inf 1'000'000'000'000
#define pb push_back
#define str string
#define sz(x) (x).size()
#define vvi vector<vi>
#define fun function
#define oopt cin.tie(0);cout.tie(0);ios_base::sync_with_stdio(false);
#define file freopen("problemname.in", "r", stdin); freopen("pr.out", "w", stdout);
#define dbg(v) cout << "Line(" << __LINE__ << ") -> " << #v << " = " << (v) << endl;

using namespace std;
template <class T, int SZ> using arr = array<T, SZ>;

int dp[2005][2005];

void solve()
{
	int n, zc, kn;
	cin >> n >> zc >> kn;
	dp[0][0] = 1;
	for (int i = 0; i < n; i++)
		for (int j = 0; j <= i; j++)
		{
			if (i+1 == zc || i+1 == kn)
			{
				dp[i+1][j+1] = (dp[i+1][j+1]+ dp[i][j] )%mod;
				dp[i+1][j] = (dp[i+1][j]+ dp[i][j] )%mod;
			}
			else
			{
				if (j > 1)
					dp[i+1][j+1] = (dp[i+1][j+1]+ dp[i][j]*(j-1) )%mod;
				dp[i+1][j-1] = (dp[i+1][j-1]+ dp[i][j]*(j-1)+(i+1<a)+(i+1<b) )%mod;
			}
		}
	cout << dp[n][1] << "\n";
}

signed main()
{
	oopt;
	int t = 1;
	// cin >> t;
	while (t--)
		solve();
	return 0;
}

Compilation message (stderr)

kangaroo.cpp: In function 'void solve()':
kangaroo.cpp:43:83: error: 'a' was not declared in this scope
   43 |                                 dp[i+1][j-1] = (dp[i+1][j-1]+ dp[i][j]*(j-1)+(i+1<a)+(i+1<b) )%mod;
      |                                                                                   ^
kangaroo.cpp:43:91: error: 'b' was not declared in this scope
   43 |                                 dp[i+1][j-1] = (dp[i+1][j-1]+ dp[i][j]*(j-1)+(i+1<a)+(i+1<b) )%mod;
      |                                                                                           ^