[권대현_FrontEnd] 2주차 과제입니다

src/problem1.js

@@ -1,5 +1,54 @@
 function problem1(pobi, crong) {
-  var answer;
+  if(pobi[0]+1 === pobi[1] && crong[0]+1 === crong[1]){
+    var pobi_num;
+    var crong_num;
+    var multiple_num=1;
+    var addition_num=0;
+    var answer;
+
+    function get_num(arr){
+      for(var i=0; i<2; i++){
+        var maxvalue;
+
+        n = arr[i].toString();
+        for(let j of n){
+          addition_num += Number(j);
+          multiple_num *= Number(j);
+        }
+        if (addition_num > multiple_num){
+          arr[i] = addition_num;
+        }
+        else{
+          arr[i] = multiple_num;
+        }
+        addition_num = 0;
+        multiple_num = 1;
+      }
+      if(arr[0] > arr[1]){
+        maxvalue = arr[0];
+      }
+      else
+        maxvalue = arr[1];
+      return maxvalue;
+    }
+
+    pobi_num = get_num(pobi);
+    crong_num = get_num(crong);
+
+    if(pobi_num > crong_num){
+      answer = 1;
+    }
+    else if(pobi_num < crong_num){
+      answer = 2;
+    }
+    else if(pobi_num == crong_num){
+      answer = 0;
+    }
+    else{
+      answer = -1;
+    }
+  } else answer = -1;
+
   return answer;
 }
 

src/problem2.js

@@ -1,5 +1,24 @@
 function problem2(cryptogram) {
   var answer;
+  var stack = [];
+  var length = 0;
+
+  n = cryptogram;
+  for(let j = 0; j < n.length; j++){
+    stack.push(n[j]);
+  }
+  while(length != stack.length){
+    length = stack.length;
+
+    for(var i=0; i<stack.length; i++){
+      if(stack[i] === stack[i+1]){
+        stack.splice(i,2);
+        i--;
+      }
+    }
+    answer = stack.join("");
+  }
+
   return answer;
 }
 

src/problem3.js

@@ -1,6 +1,20 @@
 function problem3(number) {
-  var answer;
-  return answer;
+  var clap = 0;
+  var numlist;
+  var n;
+
+  n = number.toString().length;
+  for(var i=1; i <= number; i++){
+    numlist = i.toString();
+    for(var j=0; j < numlist.length; j++){
+      var value = Number(numlist[j]);
+      if(value === 3 || value === 6 || value === 9)
+        clap++;
+    }
+  }
+
+
+  return clap;
 }
 
 module.exports = problem3;

src/problem4.js

@@ -1,6 +1,21 @@
 function problem4(word) {
-  var answer;
-  return answer;
+  var word_list_rev =[];
+  var word_list = word.split('');
+
+  for(var i = 0; i< word.length; i++){
+    var askii = word_list[i].charCodeAt(0); //문자열 첫번째 아스키코드값 가져오기
+
+    if(askii >= 65 && askii <= 90){
+      word_list_rev.push(String.fromCharCode(155-askii));
+    }
+    else if(askii >= 97 && askii <= 122){
+      word_list_rev.push(String.fromCharCode(219-askii));
+    }
+    else{
+      word_list_rev.push(' ');
+    }
+  }
+  return word_list_rev.join('');
 }
 
 module.exports = problem4;

src/problem5.js

@@ -1,6 +1,23 @@
 function problem5(money) {
-  var answer;
-  return answer;
+  var goodthing = [0,0,0,0,0,0,0,0,0];
+  goodthing[0] = Math.floor(money/50000);
+  money %= 50000;
+  goodthing[1] = Math.floor(money/10000);
+  money %= 10000;
+  goodthing[2] = Math.floor(money/5000);
+  money %= 5000;
+  goodthing[3] = Math.floor(money/1000);
+  money %= 1000;
+  goodthing[4] = Math.floor(money/500);
+  money %= 500;
+  goodthing[5] = Math.floor(money/100);
+  money %= 100;
+  goodthing[6] = Math.floor(money/50);
+  money %= 50;
+  goodthing[7] = Math.floor(money/10);
+  money %= 10;
+  goodthing[8] = Math.floor(money/1);
+  return goodthing;
 }
 
 module.exports = problem5;

src/problem6.js

@@ -1,6 +1,34 @@
 function problem6(forms) {
-  var answer;
-  return answer;
+  const emailSet = new Set(); 
+
+  function getchars(nickname) {
+    const name = new Set();
+    for (let i = 0; i < nickname.length - 1; i++) {
+      name.add(nickname.slice(i, i + 2)); 
+    }
+    return Array.from(name);
+  }
+
+  for (let i = 0; i < forms.length; i++) {
+    const [email1, nickname1] = forms[i];
+    const name1Substrings = getchars(nickname1);
+
+    for (let j = 0; j < forms.length; j++) {
+      if (i === j) continue; 
+
+      const [email2, nickname2] = forms[j];
+      for (const substring of name1Substrings) {
+        const regExp = new RegExp(substring);
+        if (regExp.test(nickname2)) {
+          emailSet.add(email1);
+          emailSet.add(email2);
+          break;
+        }
+      }
+    }
+  }
+
+  return Array.from(emailSet).sort();
 }
 
 module.exports = problem6;

src/problem7.js

@@ -1,6 +1,38 @@
 function problem7(user, friends, visitors) {
-  var answer;
-  return answer;
+  const clsrn = new Set();
+  var score = new Map();
+  var result = [];
+
+  friends.forEach(element => {//친구들 셋 추가
+    const[friend1,friend2]= element;
+    if(user === friend1){
+      clsrn.add(friend2);
+    }
+    if(user === friend2){
+      clsrn.add(friend1);
+    }
+  });
+
+
+  friends.forEach(element => {//친구의 친구 10점 추가
+    const [friend1,friend2] = element;
+    if(clsrn.has(friend1) && friend2!==user && !clsrn.has(friend2)){
+      score.set(friend2,(score.get(friend2)||0)+10);
+    }
+
+    if(clsrn.has(friend2) && friend1 !== user &&clsrn.has(friend1)){
+      score.set(friend1,(score.get(friend1)||0)+10);
+    }
+  });
+
+  visitors.forEach(visitor => {//방문자 1점 추가
+    if(!clsrn.has(visitor)){
+      score.set(visitor,(score.get(visitor)||0)+1);
+    }
+  });
+
+  result=Array.from(score).sort((a, b) => b[1] - a[1]).map(item => item[0]);
+  return result;
 }
 
 module.exports = problem7;