Submission #1284241

#	Time	Username	Problem	Language	Result	Execution time	Memory
1284241		vache_kocharyan	Zapina (COCI20_zapina)	C++20	55 / 110	35 ms	2860 KiB

zapina

#define _CRT_SECURE_NO_WARNINGS

#include <bits/stdc++.h>
#include <unordered_map>
#include <unordered_set>
#include <cassert>

using namespace std;

typedef long long ll;

#define ss second
#define ff first
#define all(X) X.begin(), X.end()
#define rall(X) X.rbegin(), X.rend()
#define cinall(X) for(auto &i:X)cin >> i
#define printall(X) for(auto &i:X)cout << i
#define printFromTo(cont, i, j, ch) for(int _ = i; _ <= j; _++)cout << cont[_] << ch
#define readFromTo(cont, i, j) for(int _ = i; _ <= j; _++)cin >> cont[_]
#define fillFromTo(cont, i, j, x) for(int _ = i; _ <= j; _++)cont[_] = x;
#define pb push_back

#define MAKE_UNIQUE_KEEP_ORDER(vec) do { \
	unordered_set<decltype((vec).front())> seen; \
	(vec).erase(remove_if((vec).begin(), (vec).end(), [&](auto &val) { \
		if (seen.count(val)) return true; \
		seen.insert(val); \
		return false; \
	}), (vec).end()); \
} while(0)

#define UNIQUE_SORT(vec) do { \
	sort((vec).begin(), (vec).end()); \
	(vec).erase(unique((vec).begin(), (vec).end()), (vec).end()); \
} while(0)

#define yes cout << "YES" << endl
#define no cout << "NO" << endl
#define MIN(v) *min_element(all(v))
#define MAX(v) *max_element(all(v))
#define LB(c, x) (lower_bound((c).begin(), (c).end(), (x)) - (c).begin())
#define UB(c, x) (upper_bound((c).begin(), (c).end(), (x)) - (c).begin())

const int N = 350 + 5;
const int LOG = 30;
const long long INFLL = 1e18;
const int INF = 1e9;
const long double epsilon = 0.000001;
const long long mod = 1e9 + 7;

constexpr ll TEN[] = {
	1LL,
	10LL,
	100LL,
	1000LL,
	10000LL,
	100000LL,
	1000000LL,
	10000000LL,
	100000000LL,
	1000000000LL,
	10000000000LL,
	100000000000LL,
	1000000000000LL,
	10000000000000LL,
	100000000000000LL,
	1000000000000000LL,
	10000000000000000LL,
	100000000000000000LL,
	1000000000000000000LL,
};

long long binPowByMod(long long x, long long power, long long modx) {
	long long res = 1;
	long long base = x % modx;
	while (power > 0) {
		if (power & 1) res = (res * base) % modx;
		base = (base * base) % modx;
		power >>= 1;
	}
	return res;
}

void set_IO(string str = "")
{
	if (!str.empty()) {
		freopen((str + ".in").c_str(), "r", stdin);
		freopen((str + ".out").c_str(), "w", stdout);
	}
}

long long add(long long x, long long y)
{
	if (x + y >= mod)
		return x + y - mod;
	else
		return x + y;
}

long long dp[N][N];
long long dp1[N][N];
long long fact[N];

long long inv(long long x)
{
	return binPowByMod(x, mod - 2, mod);
}

long long mult(long long x, long long y)
{
	return ((x * y) % mod);
}

long long sub(long long a, long long b)
{
	if (a - b < 0)
	{
		return a - b + mod;
	}
	else
	{
		return a - b;
	}
}

long long c[N][N];

void solve()
{
	int n;
	cin >> n;
	fact[1] = 1;
	fact[0] = 1;
	for (int i = 2; i < N; i++)
	{
		fact[i] = mult(fact[i - 1], i);
	}

	for (int i = 0; i <= n; i++)
	{
		dp[1][i] = 1;
		dp1[1][i] = 1;
	}

	dp1[1][1] = 0;
	dp[1][0] = 1;

	for (int i = 0; i < N; i++) {
		c[i][0] = c[i][i] = 1;
		for (int j = 1; j < i; j++) {
			c[i][j] = c[i - 1][j - 1] + c[i - 1][j];
		}
	}


	for (int i = 2; i <= n; i++)
	{
		for (int j = 0; j <= n; j++)
		{
			for (int k = 0; k <= j; k++)
			{
				dp[i][j] = add(dp[i][j], mult(dp[i - 1][j - k], c[j][k]));
				if (k != i)
					dp1[i][j] = add(dp1[i][j], mult(dp1[i - 1][j - k], c[j][k]));
					
			}
		}
	}
	cout << sub(dp[n][n], dp1[n][n]) << endl;
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	int t = 1;
	//cin >> t;
	while (t--) {
		solve();
		cout << endl;
	}
	return 0;
}

Compilation message (stderr)

zapina.cpp: In function 'void set_IO(std::string)':
zapina.cpp:87:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   87 |                 freopen((str + ".in").c_str(), "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
zapina.cpp:88:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |                 freopen((str + ".out").c_str(), "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 33 / 33
• Subtask 3: 0 / 55