week6 nkim

nkim/week6/실패율.js

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+function solution(N, stages) {
+  var answer = [];
+  const report = {};
+  [...new Array(N)].forEach((_, i) => {
+    report[i + 1] = { stop: 0, dare: 0, fail_rate: 0 };
+  });
+
+  Object.keys(report).forEach((stage) => {
+    report[stage].stop = stages.filter((s) => s == stage).length;
+    report[stage].dare = stages.filter((s) => s >= stage).length;
+  });
+  Object.entries(report).forEach(([stage, val]) => {
+    const { stop, dare } = val;
+    report[stage].fail_rate = stop / dare;
+  });
+  answer = Object.keys(report).sort(
+    (i, j) => report[j].fail_rate - report[i].fail_rate
+  );
+  answer = answer.map((data) => parseInt(data));
+  return answer;
+}

nkim/week6/없는 숫자 더하기.js

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+function solution(numbers) {
+  var answer = 0;
+  const numObj = {};
+
+  [...new Array(10)].forEach((_, i) => {
+    numObj[i] = 0;
+  });
+  numbers.forEach((num) => {
+    numObj[num]++;
+  });
+  Object.entries(numObj).forEach(([num, cnt]) => {
+    if (!cnt) answer += parseInt(num);
+  });
+
+  return answer;
+}

nkim/week6/체육복.js

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+function solution(n, lost, reserve) {
+  var answer = n - lost.length;
+  const lost_arr = lost.sort((a, b) => a - b);
+  const re_arr = reserve
+    .filter((re, i) => {
+      const idx = lost_arr.indexOf(re);
+      const flag = idx != -1;
+      if (flag) {
+        lost_arr.splice(idx, 1);
+        answer++;
+      }
+      return !flag;
+    })
+    .sort((a, b) => a - b);
+
+  re_arr.forEach((re, i) => {
+    let idx;
+    idx = lost_arr.indexOf(re - 1);
+    console.log(idx);
+    if (idx != -1) {
+      lost_arr.splice(idx, 1);
+      answer++;
+      return false;
+    }
+    idx = lost_arr.indexOf(re + 1);
+    if (idx != -1) {
+      lost_arr.splice(idx, 1);
+      answer++;
+      return false;
+    }
+  });
+
+  return answer;
+}