टास्क · स्ट्रिंग्स कठिन JavaScript ·

Count distinct substrings

/**
 * @param {string} s
 * @returns {number}
 */
function count_distinct_substrings(s)

count_distinct_substrings("abab")  // -> 7
count_distinct_substrings("aaa")  // -> 3
count_distinct_substrings("")  // -> 0

• #1Google Gemini 3.8 Flashहल किया गया · 14 में से 14 टेस्ट्स पासजवाब का समय 5.2 s · रनटाइम 500 ms · $0.0026

  ✓	count_distinct_substrings("abab")अपेक्षित 7	3 ms
  ✓	count_distinct_substrings("aaa")अपेक्षित 3	1 ms
  ✓	count_distinct_substrings("")अपेक्षित 0	<1 ms

  ✓ <1 ms✓ <1 ms✓ 1 ms✓ <1 ms✓ <1 ms✓ <1 ms✓ 1 ms✓ <1 ms⏱ 304 ms⏱ 106 ms⏱ 78 ms
  कोड

  /**
   * @param {string} s
   * @returns {number}
   */
  function count_distinct_substrings(s) {
    const n = s.length;
    if (n === 0) return 0;
  
    // Build Suffix Automaton (SAM)
    // Each state has: len, link, next
    // Number of states is at most 2 * n
    const maxStates = 2 * n;
    const len = new Int32Array(maxStates);
    const link = new Int32Array(maxStates);
    // Using an array of maps or flattened array for transitions
    // Since alphabet is small (a-z, size 26), we can use Int32Array(maxStates * 26)
    const next = new Int32Array(maxStates * 26);
    next.fill(-1);
  
    len[0] = 0;
    link[0] = -1;
    let sz = 1;
    let last = 0;
  
    for (let i = 0; i < n; i++) {
      const c = s.charCodeAt(i) - 97;
      const cur = sz++;
      len[cur] = len[last] + 1;
  
      let p = last;
      while (p !== -1 && next[p * 26 + c] === -1) {
        next[p * 26 + c] = cur;
        p = link[p];
      }
  
      if (p === -1) {
        link[cur] = 0;
      } else {
        const q = next[p * 26 + c];
        if (len[p] + 1 === len[q]) {
          link[cur] = q;
        } else {
          const clone = sz++;
          len[clone] = len[p] + 1;
          link[clone] = link[q];
          for (let j = 0; j < 26; j++) {
            next[clone * 26 + j] = next[q * 26 + j];
          }
          while (p !== -1 && next[p * 26 + c] === q) {
            next[p * 26 + c] = clone;
            p = link[p];
          }
          link[q] = clone;
          link[cur] = clone;
        }
      }
      last = cur;
    }
  
    let total = 0;
    for (let i = 1; i < sz; i++) {
      total += len[i] - len[link[i]];
    }
  
    return total;
  }

• #2OpenAI GPT-6 Lunaहल नहीं हुआ · 14 में से 13 टेस्ट्स पासजवाब का समय 6.9 s · रनटाइम 1.2 s · $0.0004

  ✓	count_distinct_substrings("abab")अपेक्षित 7	2 ms
  ✓	count_distinct_substrings("aaa")अपेक्षित 3	14 ms
  ✓	count_distinct_substrings("")अपेक्षित 0	3 ms

  ✓ 1 ms✓ 1 ms✓ <1 ms✓ 1 ms✓ <1 ms✓ 1 ms✓ 1 ms✓ 1 ms⏱ 481 ms⏱ समय सीमा समाप्त (time limit exceeded)⏱ 307 ms
  कोड

  function count_distinct_substrings(s) {
    const n = s.length;
    if (n === 0) return 0;
  
    // Suffix array by doubling, using counting sort on integer ranks.
    let sa = new Int32Array(n);
    let rank = new Int32Array(n);
    let nextRank = new Int32Array(n);
    let tmp = new Int32Array(n);
  
    for (let i = 0; i < n; i++) {
      sa[i] = i;
      rank[i] = s.charCodeAt(i) - 97;
    }
  
    for (let k = 1; k < n; k <<= 1) {
      // Stable counting sort by second key, then first key.
      const maxRank = Math.max(26, n);
      const counts = new Int32Array(maxRank + 2);
  
      for (let i = 0; i < n; i++) {
        const key = sa[i] + k < n ? rank[sa[i] + k] + 1 : 0;
        counts[key]++;
      }
      let sum = 0;
      for (let i = 0; i < counts.length; i++) {
        const c = counts[i];
        counts[i] = sum;
        sum += c;
      }
      for (let i = 0; i < n; i++) {
        const pos = sa[i];
        const key = pos + k < n ? rank[pos + k] + 1 : 0;
        tmp[counts[key]++] = pos;
      }
  
      counts.fill(0);
      for (let i = 0; i < n; i++) counts[rank[tmp[i]] + 1]++;
      sum = 0;
      for (let i = 0; i < counts.length; i++) {
        const c = counts[i];
        counts[i] = sum;
        sum += c;
      }
      for (let i = 0; i < n; i++) {
        const pos = tmp[i];
        sa[counts[rank[pos] + 1]++] = pos;
      }
  
      let classes = 1;
      nextRank[sa[0]] = 0;
      for (let i = 1; i < n; i++) {
        const a = sa[i - 1], b = sa[i];
        const a2 = a + k < n ? rank[a + k] : -1;
        const b2 = b + k < n ? rank[b + k] : -1;
        if (rank[a] !== rank[b] || a2 !== b2) classes++;
        nextRank[b] = classes - 1;
      }
      [rank, nextRank] = [nextRank, rank];
      if (classes === n) break;
    }
  
    // Kasai LCP; each suffix contributes its length minus its LCP with
    // the preceding suffix in sorted order.
    const inverse = new Int32Array(n);
    for (let i = 0; i < n; i++) inverse[sa[i]] = i;
  
    let lcp = 0;
    let result = 0;
    for (let i = 0; i < n; i++) {
      const order = inverse[i];
      if (order === 0) continue;
      const j = sa[order - 1];
      while (i + lcp < n && j + lcp < n && s.charCodeAt(i + lcp) === s.charCodeAt(j + lcp)) {
        lcp++;
      }
      result += n - i - lcp;
      if (lcp > 0) lcp--;
    }
    // The first suffix has no preceding suffix.
    result += n - sa[0];
    return result;
  }

  दूसरा प्रयास

  हल नहीं हुआ · 14 में से 11 टेस्ट्स पासजवाब का समय 5.6 s · $0.0005

  मॉडल को दिखाया गया कि कितने टेस्ट फेल हुए, फेल हुए उदाहरणों के अपेक्षित और मिले हुए परिणाम क्या थे, और छिपे हुए टेस्ट्स के फेल होने का सिर्फ़ कारण (इनपुट्स नहीं)। यह रैंकिंग या रेटिंग में नहीं गिना जाता।

  ✓	count_distinct_substrings("abab")अपेक्षित 7	6 ms
  ✓	count_distinct_substrings("aaa")अपेक्षित 3	2 ms
  ✓	count_distinct_substrings("")अपेक्षित 0	1 ms

  ✓ 1 ms✓ 3 ms✓ 2 ms✓ 1 ms✓ 1 ms✗ गलत उत्तर✓ 1 ms✗ गलत उत्तर⏱ 545 ms⏱ समय सीमा समाप्त (time limit exceeded)⏱ 266 ms

  कोड

  function count_distinct_substrings(s) {
    const n = s.length;
    if (n === 0) return 0;
  
    // Suffix array via radix-sorted prefix doubling.
    let sa = new Int32Array(n);
    let rank = new Int32Array(n);
    let nextRank = new Int32Array(n);
    let order = new Int32Array(n);
    let temp = new Int32Array(n);
  
    for (let i = 0; i < n; i++) {
      sa[i] = i;
      rank[i] = s.charCodeAt(i) - 97;
    }
  
    const counts = new Int32Array(n + 1);
  
    for (let k = 1; k < n; k *= 2) {
      // Sort suffix indices by second rank, then first rank.
      counts.fill(0);
      for (let i = 0; i < n; i++) {
        const p = sa[i];
        counts[p + k < n ? rank[p + k] + 1 : 0]++;
      }
      let sum = 0;
      for (let i = 0; i <= n; i++) {
        const c = counts[i];
        counts[i] = sum;
        sum += c;
      }
      for (let i = 0; i < n; i++) {
        const p = sa[i];
        const key = p + k < n ? rank[p + k] + 1 : 0;
        temp[counts[key]++] = p;
      }
  
      counts.fill(0);
      for (let i = 0; i < n; i++) counts[rank[temp[i]] + 1]++;
      sum = 0;
      for (let i = 0; i <= n; i++) {
        const c = counts[i];
        counts[i] = sum;
        sum += c;
      }
      for (let i = 0; i < n; i++) {
        const p = temp[i];
        order[counts[rank[p] + 1]++] = p;
      }
  
      let classes = 1;
      nextRank[order[0]] = 0;
      for (let i = 1; i < n; i++) {
        const a = order[i - 1], b = order[i];
        const a2 = a + k < n ? rank[a + k] : -1;
        const b2 = b + k < n ? rank[b + k] : -1;
        if (rank[a] !== rank[b] || a2 !== b2) classes++;
        nextRank[b] = classes - 1;
      }
      const oldRank = rank;
      rank = nextRank;
      nextRank = oldRank;
      const oldSa = sa;
      sa = order;
      order = oldSa;
      if (classes === n) break;
    }
  
    const inverse = new Int32Array(n);
    for (let i = 0; i < n; i++) inverse[sa[i]] = i;
  
    let answer = 0;
    let h = 0;
    for (let i = 0; i < n; i++) {
      const r = inverse[i];
      if (r === 0) continue;
      const j = sa[r - 1];
      while (i + h < n && j + h < n && s.charCodeAt(i + h) === s.charCodeAt(j + h)) h++;
      answer += n - i - h;
      if (h) h--;
    }
    return answer + n - sa[0];
  }

• #3SpaceXAI Grok Build 0.1हल नहीं हुआ · 14 में से 13 टेस्ट्स पासजवाब का समय 29 s · रनटाइम 1.8 s · $0.01

  ✓	count_distinct_substrings("abab")अपेक्षित 7	3 ms
  ✓	count_distinct_substrings("aaa")अपेक्षित 3	<1 ms
  ✓	count_distinct_substrings("")अपेक्षित 0	<1 ms

  ✓ 1 ms✓ <1 ms✓ <1 ms✓ 4 ms✓ 1 ms✓ <1 ms✓ <1 ms✓ <1 ms⏱ समय सीमा समाप्त (time limit exceeded)⏱ 379 ms⏱ 511 ms
  कोड

  function count_distinct_substrings(s) {
    const n = s.length;
    if (n === 0) return 0;
    const MAX = 2 * n;
    const len = new Array(MAX).fill(0);
    const link = new Array(MAX).fill(0);
    const trans = Array.from({ length: MAX }, () => new Array(26).fill(-1));
    len[0] = 0;
    link[0] = -1;
    let sz = 1;
    let last = 0;
    function addChar(c) {
      const cur = sz++;
      len[cur] = len[last] + 1;
      let p = last;
      while (p !== -1 && trans[p][c] === -1) {
        trans[p][c] = cur;
        p = link[p];
      }
      if (p === -1) {
        link[cur] = 0;
      } else {
        const q = trans[p][c];
        if (len[p] + 1 === len[q]) {
          link[cur] = q;
        } else {
          const clone = sz++;
          len[clone] = len[p] + 1;
          trans[clone] = trans[q].slice();
          link[clone] = link[q];
          while (p !== -1 && trans[p][c] === q) {
            trans[p][c] = clone;
            p = link[p];
          }
          link[q] = clone;
          link[cur] = clone;
        }
      }
      last = cur;
    }
    for (let i = 0; i < n; i++) {
      const c = s.charCodeAt(i) - 97;
      addChar(c);
    }
    let ans = 0;
    for (let i = 1; i < sz; i++) {
      ans += len[i] - len[link[i]];
    }
    return ans;
  }

  दूसरा प्रयास

  हल नहीं हुआ · 14 में से 12 टेस्ट्स पासजवाब का समय 28 s · $0.01

  मॉडल को दिखाया गया कि कितने टेस्ट फेल हुए, फेल हुए उदाहरणों के अपेक्षित और मिले हुए परिणाम क्या थे, और छिपे हुए टेस्ट्स के फेल होने का सिर्फ़ कारण (इनपुट्स नहीं)। यह रैंकिंग या रेटिंग में नहीं गिना जाता।

  ✓	count_distinct_substrings("abab")अपेक्षित 7	2 ms
  ✓	count_distinct_substrings("aaa")अपेक्षित 3	<1 ms
  ✓	count_distinct_substrings("")अपेक्षित 0	3 ms

  ✓ 2 ms✓ 1 ms✓ 2 ms✓ 1 ms✓ 1 ms✓ <1 ms✓ <1 ms✓ 1 ms⏱ गलत उत्तर⏱ 37 ms⏱ गलत उत्तर

  कोड

  function count_distinct_substrings(s) {
    const n = s.length;
    if (n === 0) return 0;
    const MAX = 2 * n + 5;
    const len = new Int32Array(MAX);
    const link = new Int32Array(MAX);
    const trans = new Int32Array(MAX * 26).fill(-1);
    len[0] = 0;
    link[0] = -1;
    let sz = 1;
    let last = 0;
    function addChar(c) {
      const cur = sz++;
      len[cur] = len[last] + 1;
      let p = last;
      while (p !== -1 && trans[p * 26 + c] === -1) {
        trans[p * 26 + c] = cur;
        p = link[p];
      }
      if (p === -1) {
        link[cur] = 0;
      } else {
        const q = trans[p * 26 + c];
        if (len[p] + 1 === len[q]) {
          link[cur] = q;
        } else {
          const clone = sz++;
          len[clone] = len[p] + 1;
          const qidx = q * 26;
          const cloneidx = clone * 26;
          for (let i = 0; i < 26; i++) {
            trans[cloneidx + i] = trans[qidx + i];
          }
          link[clone] = link[q];
          p = last;
          while (p !== -1 && trans[p * 26 + c] === q) {
            trans[p * 26 + c] = clone;
            p = link[p];
          }
          link[q] = clone;
          link[cur] = clone;
        }
      }
      last = cur;
    }
    for (let i = 0; i < n; i++) {
      const c = s.charCodeAt(i) - 97;
      addChar(c);
    }
    let ans = 0;
    for (let i = 1; i < sz; i++) {
      ans += len[i] - len[link[i]];
    }
    return ans;
  }

• #4MiniMax M3.1 Flashहल नहीं हुआ · 14 में से 12 टेस्ट्स पासजवाब का समय 6.9 s · रनटाइम 1.8 s · $0.0007

  ✓	count_distinct_substrings("abab")अपेक्षित 7	2 ms
  ✓	count_distinct_substrings("aaa")अपेक्षित 3	1 ms
  ✓	count_distinct_substrings("")अपेक्षित 0	<1 ms

  ✓ 2 ms✓ <1 ms✓ 4 ms✓ 1 ms✓ <1 ms✓ <1 ms✓ <1 ms✓ 1 ms⏱ समय सीमा समाप्त (time limit exceeded)⏱ 329 ms⏱ समय सीमा समाप्त (time limit exceeded)
  कोड

  function count_distinct_substrings(s) {
    const n = s.length;
    if (n === 0) return 0;
  
    const len = [0];
    const link = [-1];
    const next = [Object.create(null)];
    let last = 0;
  
    for (let i = 0; i < n; i++) {
      const c = s[i];
      const cur = len.length;
      len.push(len[last] + 1);
      link.push(0);
      next.push(Object.create(null));
  
      let p = last;
      while (p !== -1 && next[p][c] === undefined) {
        next[p][c] = cur;
        p = link[p];
      }
  
      if (p === -1) {
        link[cur] = 0;
      } else {
        const q = next[p][c];
        if (len[p] + 1 === len[q]) {
          link[cur] = q;
        } else {
          const clone = len.length;
          len.push(len[p] + 1);
          link.push(link[q]);
          next.push(Object.assign(Object.create(null), next[q]));
  
          while (p !== -1 && next[p][c] === q) {
            next[p][c] = clone;
            p = link[p];
          }
  
          link[q] = clone;
          link[cur] = clone;
        }
      }
  
      last = cur;
    }
  
    let result = 0;
    for (let v = 1; v < len.length; v++) {
      result += len[v] - len[link[v]];
    }
    return result;
  }

  दूसरा प्रयास

  हल नहीं हुआ · 14 में से 1 टेस्ट्स पासजवाब का समय 2.6 s · $0.0005

  मॉडल को दिखाया गया कि कितने टेस्ट फेल हुए, फेल हुए उदाहरणों के अपेक्षित और मिले हुए परिणाम क्या थे, और छिपे हुए टेस्ट्स के फेल होने का सिर्फ़ कारण (इनपुट्स नहीं)। यह रैंकिंग या रेटिंग में नहीं गिना जाता।

  ✗	count_distinct_substrings("abab")अपेक्षित 7प्राप्त 0	4 ms
  ✗	count_distinct_substrings("aaa")अपेक्षित 3प्राप्त 0	2 ms
  ✓	count_distinct_substrings("")अपेक्षित 0	1 ms

  ✗ गलत उत्तर✗ गलत उत्तर✗ गलत उत्तर✗ गलत उत्तर✗ गलत उत्तर✗ गलत उत्तर✗ गलत उत्तर✗ गलत उत्तर⏱ गलत उत्तर⏱ गलत उत्तर⏱ गलत उत्तर

  कोड

  function count_distinct_substrings(s) {
    const n = s.length;
    if (n === 0) return 0;
  
    const maxStates = 2 * n;
    const trans = new Int32Array(maxStates * 26);
    const len = new Int32Array(maxStates);
    const link = new Int32Array(maxStates);
  
    let size = 1;
    let last = 0;
  
    for (let i = 0; i < n; i++) {
      const c = s.charCodeAt(i) - 97;
      const cur = size++;
      len[cur] = len[last] + 1;
  
      let p = last;
      while (p !== -1) {
        const idx = p * 26 + c;
        if (trans[idx] !== 0) break;
        trans[idx] = cur;
        p = link[p];
      }
  
      if (p === -1) {
        link[cur] = 0;
      } else {
        const q = trans[p * 26 + c];
        if (len[p] + 1 === len[q]) {
          link[cur] = q;
        } else {
          const clone = size++;
          len[clone] = len[p] + 1;
          link[clone] = link[q];
  
          const src = q * 26;
          const dst = clone * 26;
          for (let j = 0; j < 26; j++) trans[dst + j] = trans[src + j];
  
          while (p !== -1) {
            const idx = p * 26 + c;
            if (trans[idx] !== q) break;
            trans[idx] = clone;
            p = link[p];
          }
  
          link[q] = clone;
          link[cur] = clone;
        }
      }
  
      last = cur;
    }
  
    let result = 0;
    for (let v = 1; v < size; v++) {
      result += len[v] - len[link[v]];
    }
    return result;
  }

टोकन लागत: $0.03 · राउंड कैसे आयोजित और स्कोर किए जाते हैं →