"Memory search" Devils Tower

Direct violence memory search order (abscissa, ordinate, the current energy, the number of monsters kill) to the state of the memory.

Direct look at the code:

#include <bits/stdc++.h>

using namespace std;
const int N = 12;

int h, n, m, Ans;
int dx[4] = {-1,1,0,0};
int dy[4] = {0,0,-1,1};
int f[N][N][N*N];
char a[N][N];

void dfs(int x,int y,int ene,int ans)
{
	if (ans >= f[x][y][ene]) return;
	f[x][y][ene] = ans;
	if (a[x][y] == 'E') {
		Ans = min(Ans,ans); 
		return;
	}
	for (int i=0;i<4;++i)
	{
		int nx = x+dx[i];
		int ny = y+dy[i];
		if (nx < 1 || nx > n || ny < 1 || ny > m || a[nx][ny] == '#') continue;
		if (a[nx][ny] =='C') a[nx][ny] = '.', dfs(nx,ny,ene+5,ans), a[nx][ny] = 'C';
		if (a[nx][ny] == 'M' && ene > 0) a[nx][ny] = '.', dfs(nx,ny,ene-1,ans+1), a[nx][ny] = 'M';
		if (a[nx][ny] == '.' || a[nx][ny] == 'E') dfs(nx,ny,ene,ans);
	} 
	return;
}

void work(void)
{
	Ans = INT_MAX;
	memset(f,30,sizeof f);
	for (int i=1;i<=n;++i)
	    for (int j=1;j<=m;++j)
		    cin>>a[i][j];
	for (int i=1;i<=n;++i)
	    for (int j=1;j<=m;++j)
		    if (a[i][j] == 'S') {
		    	dfs(i,j,h,0);
		    	break;
			}	
	if (Ans == INT_MAX) puts("Poor Warrior");
	else cout<<Ans<<endl;
}

int main(void)
{
	freopen("tower.in","r",stdin);
	freopen("tower.out","w",stdout);
	while (cin>>h>>n>>m) work();
	return 0;
}