Submission #102452

#	Time	Username	Problem	Language	Result	Execution time	Memory
102452		jwvg0425	마스코트 (JOI13_mascots)	C++17	100 / 100	468 ms	213520 KiB

mascots

#include <stdio.h>
#include <vector>
#include <queue>
#include <algorithm>
#include <iostream>
#include <string>
#include <bitset>
#include <map>
#include <set>
#include <tuple>
#include <string.h>
#include <math.h>
#include <random>
#include <functional>
#include <assert.h>
#include <math.h>
#include <iterator>
#include <chrono>
#define MOD 1000000007
#define all(x) (x).begin(), (x).end()
#define xx first
#define yy second

using namespace std;

using i64 = long long int;
using ii = pair<int, int>;
using ii64 = pair<i64, i64>;
using vi = vector<long long int>;

i64 table[3005][3005];
i64 ctable[3005][3005];
int r, c, n;
i64 facto[9000005];

i64 solve(int w, int h)
{
	if (w > r || h > c)
		return 0;

	if (w == r && h == c)
		return 1;

	if (table[w][h] != -1)
		return table[w][h];

	auto& res = table[w][h];
	i64 lr = (facto[h] * solve(w + 1, h)) % MOD;
	i64 ud = (facto[w] * solve(w, h + 1)) % MOD;

	res = (lr + ud) % MOD;

	return res;
}

i64 comb(int n, int k)
{
	if (k == 0 || k == n)
		return 1;

	if (ctable[n][k] != -1)
		return ctable[n][k];

	auto& res = ctable[n][k];

	res = (comb(n - 1, k - 1) + comb(n - 1, k)) % MOD;

	return res;
}

int main()
{
	memset(table, -1, sizeof(table));
	memset(ctable, -1, sizeof(ctable));

	scanf("%d %d %d", &r, &c, &n);

	int lx = r, rx = 0, ly = c, ry = 0;

	facto[0] = 1;

	for (int i = 1; i <= r * c; i++)
		facto[i] = (facto[i - 1] * i) % MOD;

	for (int i = 0; i < n; i++)
	{
		int x, y;
		scanf("%d %d", &x, &y);
		lx = min(lx, x);
		rx = max(rx, x);
		ly = min(ly, y);
		ry = max(ry, y);
	}
	int w = rx - lx + 1;
	int h = ry - ly + 1;
	int count = w * h - n;
	i64 ans = (facto[count] * solve(w, h)) % MOD;

	// 좌,우 / 상, 하 고르는 경우 끼워넣는다
	ans = (ans * comb(r - w, r - rx)) % MOD;
	ans = (ans * comb(c - h, c - ry)) % MOD;

	printf("%lld\n", ans);

	return 0;
}

Compilation message (stderr)

mascots.cpp: In function 'int main()':
mascots.cpp:76:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d", &r, &c, &n);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
mascots.cpp:88:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &x, &y);
   ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 30 / 30
• Subtask 3: 60 / 60