diff --git a/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/package.json b/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/package.json
new file mode 100644
index 0000000..12619ec
--- /dev/null
+++ b/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "complexidade-algoritmos",
+  "version": "1.0.0",
+  "main": "index.js",
+  "scripts": {
+    "linear": "clear && tsnd --transpile-only --ignore-watch node_modules ./src/linear",
+    "polynomial": "clear && tsnd --transpile-only --ignore-watch node_modules ./src/polynomial",
+    "logarithmic": "clear && tsnd --transpile-only --ignore-watch node_modules ./src/logarithmic",
+    "exponential": "clear && tsnd --transpile-only --ignore-watch node_modules ./src/exponential"
+  },
+  "author": "Labenu",
+  "license": "ISC",
+  "devDependencies": {
+    "@types/node": "^15.3.0",
+    "ts-node-dev": "^1.1.6",
+    "typescript": "^4.2.4"
+  }
+}
diff --git a/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/src/exponential/index.ts b/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/src/exponential/index.ts
new file mode 100644
index 0000000..b7f96c1
--- /dev/null
+++ b/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/src/exponential/index.ts
@@ -0,0 +1,15 @@
+import { login } from "./login"
+
+const crackPassword = (
+   passwordLength: number
+) => {
+
+   for (let i = 0; i < 10 ** passwordLength; i++) {
+      console.count()
+
+      const token = login(i)
+      if (token) return token
+   }
+}
+
+crackPassword(4)
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diff --git a/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/src/exponential/login.ts b/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/src/exponential/login.ts
new file mode 100644
index 0000000..c8d3593
--- /dev/null
+++ b/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/src/exponential/login.ts
@@ -0,0 +1,5 @@
+export const login = (
+   password: number
+) => password === 12345678
+      ? "token"
+      : undefined
\ No newline at end of file
diff --git a/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/src/linear/index.ts b/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/src/linear/index.ts
new file mode 100644
index 0000000..6268e87
--- /dev/null
+++ b/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/src/linear/index.ts
@@ -0,0 +1,7 @@
+const printUntil = (n: number) => {
+   for (let i = 0; i < n; i++) {
+      console.log({ i })
+   }
+}
+
+printUntil(100)
\ No newline at end of file
diff --git a/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/src/logarithmic/index.ts b/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/src/logarithmic/index.ts
new file mode 100644
index 0000000..14cf43f
--- /dev/null
+++ b/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/src/logarithmic/index.ts
@@ -0,0 +1,26 @@
+const binarySearch = (arr: number[], n: number) => {
+
+   let start = 0, end = arr.length - 1;
+
+   while (start <= end) {
+      console.count();
+
+      let mid = Math.floor((start + end) / 2);
+
+      if (arr[mid] === n) return n;
+
+      else if (arr[mid] < n)
+         start = mid + 1;
+      else
+         end = mid - 1;
+   }
+}
+
+const item = binarySearch(
+   [
+      1, 2, 3, 4, 5, 6, 7, 8,
+   ], 
+   9
+)
+
+console.log(item);
\ No newline at end of file
diff --git a/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/src/polynomial/index.ts b/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/src/polynomial/index.ts
new file mode 100644
index 0000000..e7d1625
--- /dev/null
+++ b/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/src/polynomial/index.ts
@@ -0,0 +1,20 @@
+const insertionSort = (array: number[]) => {
+   
+   for (let j = 1; j < array.length; j++) {
+      const value = array[j];
+      let i = j - 1;
+      while (i >= 0 && array[i] >= value) {
+         array[i + 1] = array[i];
+         i--;
+      }
+      array[i + 1] = value
+   }
+};
+
+const numbers = [
+   8, 7, 6, 5, 4, 3, 2, 1,
+]
+
+insertionSort(numbers)
+
+console.log(numbers);
diff --git a/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/tsconfig.json b/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/tsconfig.json
new file mode 100644
index 0000000..f9701d4
--- /dev/null
+++ b/Back-end/modulo2/MODULO3/complexidade-de-algoritmos/tsconfig.json
@@ -0,0 +1,14 @@
+{
+   "compilerOptions": {
+      "target": "es6",
+      "module": "commonjs",
+      "sourceMap": true,
+      "outDir": "./build",
+      "rootDir": "./src",
+      "removeComments": true,
+      "strict": true,
+      "esModuleInterop": true,
+      "skipLibCheck": true,
+      "forceConsistentCasingInFileNames": true
+   }
+}
\ No newline at end of file
diff --git a/Back-end/modulo2/MODULO3/testes-backend/.rest b/Back-end/modulo2/MODULO3/testes-backend/.rest
new file mode 100644
index 0000000..145d378
--- /dev/null
+++ b/Back-end/modulo2/MODULO3/testes-backend/.rest
@@ -0,0 +1,21 @@
+### CADASTRO
+
+POST http://localhost:3003/users/signup
+Content-Type: application/json
+
+{
+	"name": "Alice",
+	"email": "alice@lbn.com",
+	"password": "123456",
+   "role":"ADMIN"
+}
+
+### LOGIN
+
+POST http://localhost:3003/users/login
+Content-Type: application/json
+
+{
+	"email": "alice@lbn.com",
+	"password": "123456"
+}
\ No newline at end of file
diff --git a/Back-end/modulo2/MODULO3/testes-backend/.vscode/launch.json b/Back-end/modulo2/MODULO3/testes-backend/.vscode/launch.json
new file mode 100644
index 0000000..2068be4
--- /dev/null
+++ b/Back-end/modulo2/MODULO3/testes-backend/.vscode/launch.json
@@ -0,0 +1,20 @@
+{
+   // Use IntelliSense to learn about possible attributes.
+   // Hover to view descriptions of existing attributes.
+   // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+   "version": "0.2.0",
+   "configurations": [
+      {
+         "type": "node",
+         "request": "launch",
+         "name": "Launch Program",
+         "skipFiles": [
+            "<node_internals>/**"
+         ],
+         "program": "${workspaceFolder}/build/src/index.js",
+         "outFiles": [
+            "${workspaceFolder}/**/*.js"
+         ]
+      }
+   ]
+}
\ No newline at end of file