[oh-chaeyeon] 25.01.23

oh-chaeyeon/4주차_해시/A로_B_만들기.js

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+function solution(before, after) {
+  return before.split("").sort().join("") === after.split("").sort().join("")
+    ? 1
+    : 0;
+}

oh-chaeyeon/4주차_해시/등수_매기기.js

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+function solution(score) {
+  const averages = score.map((s) => (s[0] + s[1]) / 2);
+  const sortedAverages = [...averages].sort((a, b) => b - a);
+
+  return averages.map((avg) => sortedAverages.indexOf(avg) + 1);
+}

oh-chaeyeon/4주차_해시/모스부호1.js

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+function solution(letter) {
+  const morse = {
+    ".-": "a",
+    "-...": "b",
+    "-.-.": "c",
+    "-..": "d",
+    ".": "e",
+    "..-.": "f",
+    "--.": "g",
+    "....": "h",
+    "..": "i",
+    ".---": "j",
+    "-.-": "k",
+    ".-..": "l",
+    "--": "m",
+    "-.": "n",
+    "---": "o",
+    ".--.": "p",
+    "--.-": "q",
+    ".-.": "r",
+    "...": "s",
+    "-": "t",
+    "..-": "u",
+    "...-": "v",
+    ".--": "w",
+    "-..-": "x",
+    "-.--": "y",
+    "--..": "z",
+  };
+  return letter
+    .split(" ")
+    .map((code) => morse[code])
+    .join("");
+}

oh-chaeyeon/4주차_해시/오픈채팅방.js

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+function solution(record) {
+  const nicknames = {};
+  const result = [];
+
+  record.forEach((entry) => {
+    const [action, userId, nickname] = entry.split(" ");
+    if (action !== "Leave") {
+      nicknames[userId] = nickname;
+    }
+  });
+
+  record.forEach((entry) => {
+    const [action, userId] = entry.split(" ");
+    if (action === "Enter") {
+      result.push(`${nicknames[userId]}님이 들어왔습니다.`);
+    } else if (action === "Leave") {
+      result.push(`${nicknames[userId]}님이 나갔습니다.`);
+    }
+  });
+
+  return result;
+}

oh-chaeyeon/4주차_해시/완주하지_못한_선수.js

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+function solution(participant, completion) {
+  const count = participant.reduce((acc, name) => {
+    acc[name] = (acc[name] || 0) + 1;
+    return acc;
+  }, {});
+
+  completion.forEach((name) => {
+    count[name]--;
+  });
+
+  return Object.keys(count).find((name) => count[name] > 0);
+}

oh-chaeyeon/4주차_해시/진로_순서_정하기.js

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+function solution(emergency) {
+  return emergency.map(
+    (e) => [...emergency].sort((a, b) => b - a).indexOf(e) + 1
+  );
+}

oh-chaeyeon/4주차_해시/추억_점수.js

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+function solution(name, yearning, photo) {
+  return photo.map((p) =>
+    p.reduce((sum, person) => {
+      const index = name.indexOf(person);
+      return sum + (index !== -1 ? yearning[index] : 0);
+    }, 0)
+  );
+}

oh-chaeyeon/4주차_해시/폰켓몬.js

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+function solution(nums) {
+  const newNum = [...new Set(nums)];
+  const selection = nums.length / 2;
+
+  return Math.min(newNum.length, selection);
+}

oh-chaeyeon/4주차_해시/할인_행사.js

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+function solution(want, number, discount) {
+  const required = {};
+  want.forEach((item, index) => {
+    required[item] = number[index];
+  });
+
+  let day = 0;
+
+  for (let i = 0; i <= discount.length - 10; i++) {
+    const current = {};
+
+    for (let j = i; j < i + 10; j++) {
+      current[discount[j]] = (current[discount[j]] || 0) + 1;
+    }
+
+    const isValid = want.every(
+      (item) => (current[item] || 0) >= required[item]
+    );
+
+    if (isValid) day++;
+  }
+
+  return day;
+}