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gistfile1.c

#include <stdio.h>
#include <string.h>
#include <ctype.h>

#define MAX_ROW 64
#define MAX_COLUMN 64
#define ctoi(C) (C - '0')

typedef struct _room_pos {
  int m;
  int n;
} ROOM_POS;

char room[MAX_ROW][MAX_COLUMN];
int room_width, room_long;
ROOM_POS killer_room;

void parse_input() {
  int i,j;
  char line_input[80];
  fgets(line_input,80,stdin);
  sscanf((const char *)line_input,"%d %d",&room_width,&room_long);
  fgets(line_input,80,stdin);
  sscanf((const char *)line_input,"%d %d",&(killer_room.m),&(killer_room.n));

  for(i = 0; i < room_long; ++i) {
    fgets(room[i],MAX_COLUMN,stdin);
    room[i][strlen(room[i])-1] = '\0';
  }
  
}
int  find_death_room() {
  int count = 0;
  int c;
  int i;
  /* N */
  for (c = killer_room.n-2; c >= 0; --c) {
    i = ctoi(room[c][killer_room.m-1]) >> 1;
    if (i) {
      count++;
    } else
      break;
  }
  /* E */
  for (c = killer_room.m-1; c < room_width; ++c) {
    i = ctoi(room[killer_room.n-1][c]) & 1;
    if (i) {
      count++;
    } else
      break;
  }
  /* S */
  for (c = killer_room.n-1; c < room_long; ++c) {
    i = ctoi(room[c][killer_room.m-1]) >> 1;
    if (i) {
      count++;
    } else
      break;
  }
  /* W */
  for (c = killer_room.m-2; c >= 0; --c) {
    i = ctoi(room[killer_room.n-1][c]) & 1;
    if (i) {
      count++;
    } else
      break;
  }
  return count;
}
int main(int argc, char *argv[])
{
  int i;
  parse_input();
  printf("%d\n",(room_long*room_width)-find_death_room()-1);
  return 0;
}