codility/CountDistinctSlices.js at master · pfischbacher/codility · GitHub

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function solution(M, A) {
  console.log(A);
  const len = A.length;
  let result = len;
  let back = 0;
  let front = 0;
  let B = new Array();

  while( back < len) {
    while (front < len && ! B[A[front]]) {
      result += front - back;
      if (result >= 1000000000) {
        return 1000000000;
      }
      B[A[front]] = true;
      front++;
    }
    while (A[back] != A[front]) {
      B[A[back]] = false;
      back++;
    }
    B[A[back]] = false;
    back++;
  }

  return result;
}


const tests = [
  {
    data:{
      M: 6,
      A: [3, 4, 5, 5, 2]
    },
    expect: 9
  },
  {
    data:{
      M: 6,
      A: [ 1, 3, 4, 1, 2, 1, 3, 2, 1 ]
    },
    expect: 24
  },
  {
    data:{
      M: 6,
      A: [1, 2, 3, 4, 5, 9, 10, 4, 5]
    },
    expect: 36
  },
  {
    data:{
      M: 6,
      A: [ 2, 3, 3, 3, 2, 4, 1, 2, 5, 1, 4, 5, 1, 4 ]
    },
    expect: 37
  },
  {
    data:{
      M: 6,
      A: [1, 1]
    },
    expect: 2
  },
  {
    data:{
      M: 6,
      A: [1, 1, 5, 5, 2, 9, 10, 4, 5]
    },
    expect: 24
  },
  {
    data:{
      M: 6,
      A: [3, 4, 1, 2, 1, 3 ]
    },
    expect: 15
  }
];

for (let i = 0; i < tests.length; i++) {
  let index = i + 1;
  console.log('Answer ' + index + ':', solution(tests[i].data.M, tests[i].data.A), '| Expect', tests[i].expect);
  console.log('********************************');
}