diff --git a/logic-exercises/package.json b/logic-exercises/package.json
index eb6d6ea..6291264 100644
--- a/logic-exercises/package.json
+++ b/logic-exercises/package.json
@@ -5,7 +5,9 @@
   "main": "index.js",
   "scripts": {
     "ex1": "clear && tsnd --transpile-only --ignore-watch node_modules src/exc1.ts",
-    "ex2": "clear && tsnd --transpile-only --ignore-watch node_modules src/exc2.ts"
+    "ex2": "clear && tsnd --transpile-only --ignore-watch node_modules src/exc2.ts",
+    "ex3": "clear && tsnd --transpile-only --ignore-watch node_modules src/exc3.ts",
+    "ex4": "clear && tsnd --transpile-only --ignore-watch node_modules src/exc4.ts"
   },
   "keywords": [],
   "author": "Daniel Ratti",
diff --git a/logic-exercises/src/exc3.ts b/logic-exercises/src/exc3.ts
new file mode 100644
index 0000000..4781700
--- /dev/null
+++ b/logic-exercises/src/exc3.ts
@@ -0,0 +1,25 @@
+export const checkParentheses = (str: string) => {
+  const stack = [];
+  for (let char of str) {
+    if (char === "(" || char === "[" || char === "{") {
+      stack.push(char);
+    } else {
+      const lastOpeningChar = stack.pop();
+      if (!lastOpeningChar) {
+        return false;
+      } else if (
+        (lastOpeningChar === "(" && char !== ")") ||
+        (lastOpeningChar === "[" && char !== "]") ||
+        (lastOpeningChar === "{" && char !== "}")
+      ) {
+        return false;
+      }
+    }
+  }
+
+  if (stack.length > 0) {
+    return false;
+  }
+
+  return true;
+};
diff --git a/logic-exercises/src/exc4.ts b/logic-exercises/src/exc4.ts
new file mode 100644
index 0000000..ae387f7
--- /dev/null
+++ b/logic-exercises/src/exc4.ts
@@ -0,0 +1,20 @@
+export const houseThief = (houses: number[]) => {
+  if (houses.length === 1) {
+    return houses[0];
+  } else if (houses.length === 0) {
+    return 0;
+  }
+
+  let currentMax: number = 0;
+  let prevMax: number = 0;
+
+  for (let i = 0; i < houses.length; i++) {
+    let currentHouse = houses[i];
+    let newMax = Math.max(currentMax, prevMax + currentHouse);
+    prevMax = currentMax;
+    currentMax = newMax;
+  }
+
+  return currentMax;
+};
+console.log(houseThief([1, 3, 5, 4, 2]));