課題 · データ処理 中級 JavaScript ·

Bank ledger

/**
 * @param {Array[]} ops
 * @returns {Object<string, number>}
 */
function balances(ops)

balances([["open", "ann"], ["open", "bob"], ["deposit", "ann", 100], ["transfer", "ann", "bob", 30], ["withdraw", "bob", 50]])  // -> {"ann": 70, "bob": 30}

• #1MiniMax M3.1 Flash正解 · 11 / 11 件のテストにパス回答時間 2.1 秒 · 実行時間 477 ms · $0.0003

  ✓

  balances([["open", "ann"], ["open", "bob"], ["deposit", "ann", 100], ["transfer", "ann", "bob", 30], ["withdraw", "bob", 50]])期待値 {"ann": 70, "bob": 30}

  3 ms

  ✓ 3 ms✓ <1 ms✓ 1 ms✓ <1 ms✓ <1 ms✓ 2 ms✓ 4 ms✓ <1 ms✓ <1 ms⏱ 460 ms
  コード

  function balances(ops) {
    const accounts = Object.create(null);
  
    for (let i = 0; i < ops.length; i++) {
      const op = ops[i];
      const type = op[0];
  
      if (type === "open") {
        const name = op[1];
        if (!Object.prototype.hasOwnProperty.call(accounts, name)) {
          accounts[name] = 0;
        }
        continue;
      }
  
      if (type === "deposit" || type === "withdraw") {
        const name = op[1];
        const amount = op[2];
  
        if (!Object.prototype.hasOwnProperty.call(accounts, name)) continue;
        if (!(amount > 0)) continue;
  
        if (type === "deposit") {
          accounts[name] += amount;
        } else {
          if (accounts[name] < amount) continue;
          accounts[name] -= amount;
        }
        continue;
      }
  
      if (type === "transfer") {
        const from = op[1];
        const to = op[2];
        const amount = op[3];
  
        if (!Object.prototype.hasOwnProperty.call(accounts, from)) continue;
        if (!Object.prototype.hasOwnProperty.call(accounts, to)) continue;
        if (from === to) continue;
        if (!(amount > 0)) continue;
        if (accounts[from] < amount) continue;
  
        accounts[from] -= amount;
        accounts[to] += amount;
      }
    }
  
    return accounts;
  }

• #1Google Gemini 3.8 Flash正解 · 11 / 11 件のテストにパス回答時間 5.8 秒 · 実行時間 493 ms · $0.0041

  ✓

  balances([["open", "ann"], ["open", "bob"], ["deposit", "ann", 100], ["transfer", "ann", "bob", 30], ["withdraw", "bob", 50]])期待値 {"ann": 70, "bob": 30}

  2 ms

  ✓ 2 ms✓ 1 ms✓ 1 ms✓ <1 ms✓ 1 ms✓ <1 ms✓ <1 ms✓ 1 ms✓ 2 ms⏱ 480 ms
  コード

  /**
   * @param {Array[]} ops
   * @returns {Object<string, number>}
   */
  function balances(ops) {
    const accounts = new Map();
  
    for (let i = 0; i < ops.length; i++) {
      const op = ops[i];
      const type = op[0];
  
      if (type === "open") {
        const name = op[1];
        if (!accounts.has(name)) {
          accounts.set(name, 0);
        }
      } else if (type === "deposit") {
        const name = op[1];
        const amount = op[2];
        if (amount > 0 && accounts.has(name)) {
          accounts.set(name, accounts.get(name) + amount);
        }
      } else if (type === "withdraw") {
        const name = op[1];
        const amount = op[2];
        if (amount > 0 && accounts.has(name)) {
          const bal = accounts.get(name);
          if (bal >= amount) {
            accounts.set(name, bal - amount);
          }
        }
      } else if (type === "transfer") {
        const fromName = op[1];
        const toName = op[2];
        const amount = op[3];
        if (
          fromName !== toName &&
          amount > 0 &&
          accounts.has(fromName) &&
          accounts.has(toName)
        ) {
          const fromBal = accounts.get(fromName);
          if (fromBal >= amount) {
            accounts.set(fromName, fromBal - amount);
            accounts.set(toName, accounts.get(toName) + amount);
          }
        }
      }
    }
  
    const result = {};
    for (const [name, bal] of accounts) {
      result[name] = bal;
    }
    return result;
  }

• #1DeepSeek V4.1 Flash正解 · 11 / 11 件のテストにパス回答時間 750 ms · 実行時間 537 ms · $0.0003

  ✓

  balances([["open", "ann"], ["open", "bob"], ["deposit", "ann", 100], ["transfer", "ann", "bob", 30], ["withdraw", "bob", 50]])期待値 {"ann": 70, "bob": 30}

  3 ms

  ✓ <1 ms✓ <1 ms✓ <1 ms✓ <1 ms✓ <1 ms✓ <1 ms✓ <1 ms✓ 1 ms✓ <1 ms⏱ 527 ms
  コード

  function balances(ops) {
    const accounts = Object.create(null);
    const has = (name) => Object.prototype.hasOwnProperty.call(accounts, name);
  
    for (let i = 0; i < ops.length; i++) {
      const op = ops[i];
      const type = op[0];
      if (type === "open") {
        const name = op[1];
        if (!has(name)) accounts[name] = 0;
      } else if (type === "deposit") {
        const name = op[1], amount = op[2];
        if (has(name) && amount > 0) accounts[name] += amount;
      } else if (type === "withdraw") {
        const name = op[1], amount = op[2];
        if (has(name) && amount > 0 && accounts[name] >= amount) accounts[name] -= amount;
      } else if (type === "transfer") {
        const from = op[1], to = op[2], amount = op[3];
        if (
          from !== to &&
          has(from) &&
          has(to) &&
          amount > 0 &&
          accounts[from] >= amount
        ) {
          accounts[from] -= amount;
          accounts[to] += amount;
        }
      }
    }
  
    return Object.assign({}, accounts);
  }

• #1OpenAI GPT-6 Luna正解 · 11 / 11 件のテストにパス回答時間 2.7 秒 · 実行時間 552 ms · $0.0002

  ✓

  balances([["open", "ann"], ["open", "bob"], ["deposit", "ann", 100], ["transfer", "ann", "bob", 30], ["withdraw", "bob", 50]])期待値 {"ann": 70, "bob": 30}

  4 ms

  ✓ 1 ms✓ 3 ms✓ 2 ms✓ 2 ms✓ <1 ms✓ <1 ms✓ 1 ms✓ <1 ms✓ 1 ms⏱ 534 ms
  コード

  function balances(ops) {
    const accounts = new Map();
  
    for (const op of ops) {
      const type = op[0];
  
      if (type === "open") {
        if (!accounts.has(op[1])) accounts.set(op[1], 0);
      } else if (type === "deposit") {
        const name = op[1], amount = op[2];
        if (accounts.has(name) && amount > 0) {
          accounts.set(name, accounts.get(name) + amount);
        }
      } else if (type === "withdraw") {
        const name = op[1], amount = op[2];
        if (accounts.has(name) && amount > 0 && accounts.get(name) >= amount) {
          accounts.set(name, accounts.get(name) - amount);
        }
      } else if (type === "transfer") {
        const from = op[1], to = op[2], amount = op[3];
        if (from !== to && amount > 0 && accounts.has(from) && accounts.has(to) &&
            accounts.get(from) >= amount) {
          accounts.set(from, accounts.get(from) - amount);
          accounts.set(to, accounts.get(to) + amount);
        }
      }
    }
  
    return Object.fromEntries(accounts);
  }

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