LA2995 Image is everything

蓝书P12

#include <cstdio>
#include <cstring>
#include <cmath>
#include <algorithm>
using namespace std;
#define REP(i,n) for(int i=0;i<(n);i++)
const int maxn = ;
int n;
char pos[maxn][maxn][maxn];
char view[][maxn][maxn];
char read_cahr(){
  char ch;
  for(;;){
    ch=getchar();
    if((ch>='A'&&ch<='Z')||ch=='.') return ch;
  }
}
void get(int k,int i,int j,int len,int  &x,int &y,int &z){
  if(k==){ x=len; y=j; z=i;}
  if(k==){ x=n--j; y=len; z=i;}
  if(k==){ x=n--len; y=n-j-; z=i;}
  if(k==){ x=j; y=n--len; z=i;}
  if(k==){ x=n-i-; y=j; z=len;}
  if(k==){ x=i; y=j; z=n--len;}
}
int main(){
  while(scanf("%d",&n)==&&n){
    REP(i,n) REP(k,) REP(j,n) view[k][i][j]=read_cahr();
    REP(i,n) REP(j,n) REP(k,n) pos[i][j][k]='#';
    REP(k,) REP(i,n) REP(j,n) if(view[k][i][j]=='.')
      REP(p,n){
      int x,y,z;
      get(k,i,j,p,x,y,z);
      pos[x][y][z]='.';
    }
    for(;;){
      bool done=true;
      REP(k,) REP(i,n) REP(j,n) if(view[k][i][j]!='.'){
        REP(p,n){
        int x,y,z;
        get(k,i,j,p,x,y,z);
        if(pos[x][y][z]=='.') continue;
        if(pos[x][y][z]=='#'){
          pos[x][y][z]=view[k][i][j];
          break;
      }
      if(pos[x][y][z]==view[k][i][j]) break;
      pos[x][y][z]='.';
      done=false;
      }
    }
    if(done) break;
  }
  int ans=;
  REP(i,n) REP(j,n) REP(k,n)
   if(pos[i][j][k]!='.') ans++;
   printf("Maximum weight: %d gram(s)\n",ans);
 }
 return ;
}