This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <cstdio>
#include <queue>
#include <utility>
using namespace std;
int main(){
int m,n,h;scanf("%d %d %d",&m,&n,&h);
int table[n][m][h];
for(int k=0;k<h;k++)
for(int i=0;i<n;i++)
for(int j=0;j<m;j++)
scanf("%d",&table[i][j][k]);
queue< pair< pair<int,int>,pair<int,int> > > q;
for(int i=0;i<n;i++)
for(int j=0;j<m;j++)
for(int k=0;k<h;k++)
if(table[i][j][k]==1)
q.push(make_pair(make_pair(i,j),make_pair(k,0)));
int ans=0;
while(!q.empty()){
int z=q.front().second.first;
int y=q.front().first.first;
int x=q.front().first.second;
int level=q.front().second.second;
int dz[6]={1,0,0,0,0,-1};
int dy[6]={0,1,-1,0,0,0};
int dx[6]={0,0,0,1,-1,0};
if(level>ans)ans=level;
for(int i=0;i<6;i++){
int zz=z+dz[i];
int yy=y+dy[i];
int xx=x+dx[i];
if(zz<h&&zz>=0&&yy<n&&yy>=0&&xx<m&&xx>=0)
if(table[yy][xx][zz]==0){
table[yy][xx][zz]=1;
q.push(make_pair(make_pair(yy,xx),make_pair(zz,level+1)));
//printf("%d %d\n",yy,xx);
}
}
q.pop();
}
for(int i=0;i<n;i++)
for(int j=0;j<m;j++)
for(int k=0;k<h;k++)
if(table[i][j][k]==0)ans=-1;
printf("%d",ans);
}
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