oj.uz

Submission #62314

# Submission time Handle Problem Language Result Execution time Memory
62314 2018-07-28T04:50:34 Z qkxwsm Tents (JOI18_tents) C++17
100 / 100
 458 ms 68160 KB 
/*
PROG: source
LANG: C++11
    _____
  .'     '.
 /  0   0  \
|     ^     |
|  \     /  |
 \  '---'  /
  '._____.'
 */
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;

struct chash
{
    int operator()(int x) const
	{
		x ^= (x >> 20) ^ (x >> 12);
    	return x ^ (x >> 7) ^ (x >> 4);
	}
	int operator()(long long x) const
	{
		return x ^ (x >> 32);
	}
};

template<typename T> using orderedset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T> using hashtable = gp_hash_table<T, T, chash>;

template<class T>
void readi(T &x)
{
	T input = 0;
	bool negative = false;
	char c = ' ';
	while (c < '-')
	{
		c = getchar();
	}
	if (c == '-')
	{
		negative = true;
		c = getchar();
	}
	while (c >= '0')
	{
		input = input * 10 + (c - '0');
		c = getchar();
	}
	if (negative)
	{
		input = -input;
	}
	x = input;
}
template<class T>
void printi(T output)
{
	if (output == 0)
	{
		putchar('0');
		return;
	}
	if (output < 0)
	{
		putchar('-');
		output = -output;
	}
	int aout[20];
	int ilen = 0;
	while(output)
	{
		aout[ilen] = ((output % 10));
		output /= 10;
		ilen++;
	}
	for (int i = ilen - 1; i >= 0; i--)
	{
		putchar(aout[i] + '0');
	}
	return;
}
template<class T>
void ckmin(T &a, T b)
{
	a = min(a, b);
}
template<class T>
void ckmax(T &a, T b)
{
	a = max(a, b);
}
template<class T>
T normalize(T x, T mod = 1000000007)
{
	return (((x % mod) + mod) % mod);
}
long long randomizell(long long mod)
{
	return ((1ll << 45) * rand() + (1ll << 30) * rand() + (1ll << 15) * rand() + rand()) % mod;
}
int randomize(int mod)
{
	return ((1ll << 15) * rand() + rand()) % mod;
}

#define y0 ___y0
#define y1 ___y1
#define MP make_pair
#define MT make_tuple
#define PB push_back
#define PF push_front
#define LB lower_bound
#define UB upper_bound
#define fi first
#define se second
#define debug(x) cerr << #x << " = " << x << endl;

const long double PI = 4.0 * atan(1.0);
const long double EPS = 1e-10;

#define MAGIC 347
#define SINF 10007
#define CO 1000007
#define INF 1000000007
#define BIG 1000000931
#define LARGE 1696969696967ll
#define GIANT 2564008813937411ll
#define LLINF 2696969696969696969ll
#define MAXN 3013

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<ld, ld> pdd;

int H, W;
ll dp[MAXN][MAXN];
bool seen[MAXN][MAXN];
ll ans;

ll solve(ll a, ll b)
{
    if (a < 0 || b < 0)
    {
        return 0;
    }
    if (a == 0 || b == 0)
    {
        return 1;
    }
    if (seen[a][b])
    {
        return dp[a][b];
    }
    seen[a][b] = true;
    //CONSIDER TOP ROW: place a NS, place an EW, place a N (NO MATCH), a S, a E, a W, a nothing
    dp[a][b] += (b) * (a - 1) * solve(a - 2, b - 1);
    dp[a][b] += (b) * (b - 1) / 2 * solve(a - 1, b - 2);
    dp[a][b] += 4ll * b * solve(a - 1, b - 1);
    dp[a][b] += solve(a - 1, b);
    dp[a][b] %= INF;
    return dp[a][b];
}

int32_t main()
{
	ios_base::sync_with_stdio(0);
	srand(time(0));
	//	cout << fixed << setprecision(10);
	//	cerr << fixed << setprecision(10);
	if (fopen("input.in", "r"))
	{
		freopen ("input.in", "r", stdin);
		freopen ("output.out", "w", stdout);
	}
    cin >> H >> W;
    ans = solve(H, W);
    ans += (INF - 1);
    ans %= INF;
    cout << ans << '\n';
    //i by W grid, where x of them can only have S and everything else is free
	//	cerr << "time elapsed = " << (clock() / (CLOCKS_PER_SEC / 1000)) << " ms" << endl;
	return 0;
}

Compilation message

tents.cpp: In function 'int32_t main()':
tents.cpp:180:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen ("input.in", "r", stdin);
   ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
tents.cpp:181:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen ("output.out", "w", stdout);
   ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
48.0 / 48.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 376 KB Output is correct
2 Correct 4 ms 500 KB Output is correct
3 Correct 3 ms 816 KB Output is correct
4 Correct 4 ms 1944 KB Output is correct
5 Correct 3 ms 1944 KB Output is correct
6 Correct 5 ms 2240 KB Output is correct
7 Correct 4 ms 2240 KB Output is correct
8 Correct 6 ms 2376 KB Output is correct
9 Correct 4 ms 2376 KB Output is correct
10 Correct 7 ms 2940 KB Output is correct
11 Correct 4 ms 2940 KB Output is correct
12 Correct 7 ms 3204 KB Output is correct

Subtask #2
52.0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 376 KB Output is correct
2 Correct 4 ms 500 KB Output is correct
3 Correct 3 ms 816 KB Output is correct
4 Correct 4 ms 1944 KB Output is correct
5 Correct 3 ms 1944 KB Output is correct
6 Correct 5 ms 2240 KB Output is correct
7 Correct 4 ms 2240 KB Output is correct
8 Correct 6 ms 2376 KB Output is correct
9 Correct 4 ms 2376 KB Output is correct
10 Correct 7 ms 2940 KB Output is correct
11 Correct 4 ms 2940 KB Output is correct
12 Correct 7 ms 3204 KB Output is correct
13 Correct 3 ms 3204 KB Output is correct
14 Correct 22 ms 16784 KB Output is correct
15 Correct 345 ms 55792 KB Output is correct
16 Correct 7 ms 55792 KB Output is correct
17 Correct 27 ms 55792 KB Output is correct
18 Correct 63 ms 55792 KB Output is correct
19 Correct 290 ms 62316 KB Output is correct
20 Correct 244 ms 62316 KB Output is correct
21 Correct 167 ms 62316 KB Output is correct
22 Correct 157 ms 62316 KB Output is correct
23 Correct 143 ms 62316 KB Output is correct
24 Correct 458 ms 68160 KB Output is correct
25 Correct 332 ms 68160 KB Output is correct
26 Correct 379 ms 68160 KB Output is correct
27 Correct 361 ms 68160 KB Output is correct