Lehmät

const { readSync } = require('fs');
const { Buffer } = require('buffer');


function readline() {
  let buf = Buffer.alloc(1000, 10);
  for(i=0; i<1000; i++) {
    if(!readSync(0, buf, i, 1) || buf[i]===10) {
      return buf.toString("utf8").split("\n")[0];
    }
  }
}

let [h, w] = readline().split(" ").map(e=>Number(e));
let lines = Array(h).fill().map(e=>readline().split(""));

let fencen = lines.map(e=>e.some(f=>f==="*")).indexOf(true);
let fences = lines.map(e=>e.some(f=>f==="*")).lastIndexOf(true);
let fencew = lines[fencen].indexOf("*");
let fencee = lines[fencen].lastIndexOf("*");

console.log(
  lines.map((a,y)=>
    a.map((b,x)=>
      (b=="@"&&y>=fencen&&y<=fences&&x>=fencew&&x<=fencee)
      ?true
      :false
    )
  )
  .flat(1)
  .filter(e=>e)
  .length
);

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 1, 2

Verdict: ACCEPTED

Test 3

Group: 1, 2

Verdict: ACCEPTED

Test 4

Group: 1, 2

Verdict: ACCEPTED

Test 5

Group: 1, 2

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED