Submission #112514

#	Time	Username	Problem	Language	Result	Execution time	Memory
112514		Kastanda	Wall (CEOI14_wall)	C++11	30 / 100	863 ms	20196 KiB

wall

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 44, K = 10;
int n, m, vert[N][N], horz[N][N], F[N][N];
ll dp[N][N][1 << K];
priority_queue < pair < ll , int > > Pq;
inline void Relax(int a, int b, int mask, ll d)
{
	if (dp[a][b][mask] > d)
	{
		dp[a][b][mask] = d;
		Pq.push(make_pair(- d, (mask << 12) | (b << 6) | a));
	}
}
int main()
{
	scanf("%d%d", &n, &m);
	vector < pair < int , int > > vec;
	for (int i = 0; i < n; i++)
		for (int j = 0; j < m; j++)
		{
			int b;
			scanf("%d", &b);
			if (b)
				vec.push_back({i, j});
		}
	for (int i = 0; i < n; i++)
		for (int j = 0; j <= m; j++)
			scanf("%d", &vert[i][j]);
	for (int i = 0; i <= n; i++)
		for (int j = 0; j < m; j++)
			scanf("%d", &horz[i][j]);
	for (int i = 0; i < n; i++)
		for (int j = 0; j < m; j++)
		{
			for (int h = 0; h < (int)vec.size(); h++)
				if (vec[h].first >= i && vec[h].second == j)
					F[i][j] ^= 1 << h;
		}
	assert((int)vec.size() <= 10);
	memset(dp, 63, sizeof(dp)); dp[0][0][0] = 0;
	Pq.push({0, 0});
	while (Pq.size())
	{
		int d, a, b, mask, tmp;
	   	d = - Pq.top().first;
		tmp = Pq.top().second;
		a = tmp & 63; tmp >>= 6;
		b = tmp & 63; tmp >>= 6;
		mask = tmp;
		Pq.pop();
		if (d > dp[a][b][mask])
			continue;

		// Up :
		if (a > 0)
			Relax(a - 1, b, mask, d + vert[a - 1][b]);

		// Down :
		if (a < n)
			Relax(a + 1, b, mask, d + vert[a][b]);

		// Left :
		if (b > 0)
			Relax(a, b - 1, mask ^ F[a][b - 1], d + horz[a][b - 1]);

		// Right :
		if (b < m)
			Relax(a, b + 1, mask ^ F[a][b], d + horz[a][b]);
	}
	return !printf("%lld\n", dp[0][0][(1 << (int)vec.size()) - 1]);
}

Compilation message (stderr)

wall.cpp: In function 'int main()':
wall.cpp:18:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &m);
  ~~~~~^~~~~~~~~~~~~~~~
wall.cpp:24:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &b);
    ~~~~~^~~~~~~~~~
wall.cpp:30:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &vert[i][j]);
    ~~~~~^~~~~~~~~~~~~~~~~~~
wall.cpp:33:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &horz[i][j]);
    ~~~~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 0 / 30
• Subtask 3: 0 / 40