[박성주_FrontEnd] 2주차 과제 제출입니다.

src/problem1.js

@@ -1,6 +1,30 @@
 function problem1(pobi, crong) {
-  var answer;
-  return answer;
+  if (pobi[1] - pobi[0] !== 1 || crong[1] - crong[0] !== 1) {
+    return -1;
+  }
+  const pobiMax = Math.max(maxValue(String(pobi[0])), maxValue(String(pobi[1])));
+  const crongMax = Math.max(maxValue(String(crong[0])), maxValue(String(crong[1])));
+
+  if(pobiMax > crongMax){
+    return 1;
+  } else if(pobiMax < crongMax){
+    return 2;
+  } else {
+    return 0;
+  }
+
+}
+
+function maxValue(page){
+  let sum = 0;
+  let mul = 1;
+  const pageStr = page.split("");
+  for(let i of pageStr){
+    sum += Number(i);
+    mul *= Number(i);
+  }
+  return Math.max(sum, mul);
 }
 
+
 module.exports = problem1;

src/problem2.js

@@ -1,6 +1,14 @@
 function problem2(cryptogram) {
-  var answer;
-  return answer;
+  const stack = [];
+  let secret = cryptogram.split("");
+  for( let i = 0; i < secret.length; i++){
+    stack.push(secret[i]);
+    if(stack.length >= 2 && stack[stack.length - 1] === stack[stack.length - 2]){
+      stack.pop();
+      stack.pop();
+    }
+  }
+  return stack.join("");
 }
 
 module.exports = problem2;

src/problem3.js

@@ -1,6 +1,14 @@
 function problem3(number) {
-  var answer;
-  return answer;
+  let clap = 0;
+  for(let i=1; i<=number; i++){
+    let str = String(i).split("");
+    for(let j of str){
+      if(j === "3" || j === "6" || j === "9"){
+        clap+=1;
+      }
+    }
+  }
+  return clap;
 }
 
 module.exports = problem3;

src/problem4.js

@@ -1,6 +1,24 @@
 function problem4(word) {
-  var answer;
-  return answer;
+  let result = '';
+
+  for (let i = 0; i < word.length; i++) {
+    const char = word[i];
+    const charCode = char.charCodeAt(0);
+
+    if (charCode >= 65 && charCode <= 90) {
+      const newCharCode = 90 + 65 - charCode;
+      result += String.fromCharCode(newCharCode);
+    } 
+    else if (charCode >= 97 && charCode <= 122) {
+      const newCharCode = 122 + 97 - charCode;
+      result += String.fromCharCode(newCharCode);
+    } 
+    else {
+      result += char;
+    }
+  }
+  return result;
 }
 
+
 module.exports = problem4;

src/problem5.js

@@ -1,5 +1,12 @@
 function problem5(money) {
-  var answer;
+  const change = [50000, 10000, 5000, 1000, 500, 100, 50, 10, 1];
+  let answer = Array(change.length).fill(0);
+  let i = 0;
+  while(money !== 0){
+    answer[i] = parseInt(money/change[i]);
+    money = money % change[i];
+    i++;
+  }
   return answer;
 }