[FE]: Code challenge solution - Duong Phuoc Thinh

src/problem1/prob1.js

@@ -0,0 +1,24 @@
+var sum_to_n_a = function (n) {
+    //Time Complexity O(n)
+    let total = 0;
+    for (var i = 1; i <= n; i++) {
+        total += i;
+    }
+    return total;
+};
+
+var sum_to_n_b = function (n) {
+    //Time Complexity O(1)
+    return (n * (n + 1)) / 2;
+};
+
+var sum_to_n_c = function (n) {
+    //Time Complexity O(n)
+    let sum = 0;
+    let i = 1;
+    while (i <= n) {
+        sum += i;
+        i++;
+    }
+    return sum;
+};

src/problem2/.gitignore

@@ -0,0 +1,24 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?