Ruudukko

const rl = require('readline').createInterface({
  input: process.stdin,
  output: process.stdout,
  terminal: false
});

let n;
let grid;
let input;

let c = 0;
rl.on('line', line => {
  if (!n) {
    n = Number(line);
    grid = new Array(n);
    input = new Array(n);
    return;
  }

  let coins = 0;
  let grid_line = new Array(n);
  for (let i = 0; i < n; i++) {
    if (line[i] === 'o') coins++;
    grid_line[i] = [coins];
  }

  grid[c] = grid_line;
  input[c] = line;

  if (++c === n) rl.close();
});

rl.on('close', () => {
  for (let i = 1; i < n; i++) {
    for (let j = 1; j < n; j++) {
      if (input[i][j] === 'o') {
        grid[i][j] = [...new Set([
          ...grid[i][j - 1],
          ...grid[i - 1][j]
        ])].map(val => val + 1);
      } else {
        grid[i][j] = [...new Set([
          ...grid[i][j - 1],
          ...grid[i - 1][j]
        ])];
      }
    }
  }

  console.log(grid[n-1][n-1].length);
});

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

Test 2

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 3

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 4

Group: 1, 2, 3

Verdict: ACCEPTED

Test 5

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 6

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 7

Group: 2, 3

Verdict: ACCEPTED

Test 8

Group: 2, 3

Verdict: ACCEPTED

Test 9

Group: 2, 3

Verdict: WRONG ANSWER

Test 10

Group: 2, 3

Verdict: WRONG ANSWER

Test 11

Group: 2, 3

Verdict: WRONG ANSWER

Test 12

Group: 2, 3

Verdict: WRONG ANSWER

Test 13

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 14

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 15

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 16

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 17

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 18

Group: 3

Verdict: TIME LIMIT EXCEEDED