diff --git a/tareas/prueba.tex b/tareas/prueba.tex
new file mode 100644
index 0000000..4fbd3ba
--- /dev/null
+++ b/tareas/prueba.tex
@@ -0,0 +1,5 @@
+\documentclass[options]{article}
+
+\begin{document}
+hola mundo!
+\end{document}
\ No newline at end of file
diff --git a/tareas/tarea_3/busqueda_dos_en_dos/busqueda_dos_en_dos.cpp b/tareas/tarea_3/busqueda_dos_en_dos/busqueda_dos_en_dos.cpp
new file mode 100644
index 0000000..64590b6
--- /dev/null
+++ b/tareas/tarea_3/busqueda_dos_en_dos/busqueda_dos_en_dos.cpp
@@ -0,0 +1,42 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+int busquedaDosEnDos(const vector<int>& lista, int objetivo) {
+    int n = lista.size();
+    for (int i = 0; i < n; i += 2) {
+        if (lista[i] == objetivo) {
+            return i;
+        }
+        if (i + 1 < n && lista[i + 1] == objetivo) {
+            return i + 1;
+        }
+    }
+    return -1; 
+}
+int main() {
+    vector<int> lista;
+    int n, x;
+    cout << "ingrese la cantidad de elementos: ";
+    cin >> n;
+    cout << "ingrese los elementos:\n";
+    for (int i = 0; i < n; i++) {
+        cin >> x;
+        lista.push_back(x);
+    }
+    char continuar = 's';
+    while (continuar == 's' || continuar == 'S') {
+        int objetivo;
+        cout << "\ningrese el numero a buscar: ";
+        cin >> objetivo;
+        int resultado = busquedaDosEnDos(lista, objetivo);
+        if (resultado != -1) {
+            cout << "objetivo encontrado en : " << resultado << endl;
+        } else {
+            cout << "objetivo no existe" << endl;
+        }
+
+        cout << "\n desea buscar otro numero? (s/n): ";
+        cin >> continuar;
+    }
+    return 0;
+}
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diff --git a/tareas/tarea_3/busqueda_dos_en_dos/busqueda_dos_en_dos.exe b/tareas/tarea_3/busqueda_dos_en_dos/busqueda_dos_en_dos.exe
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diff --git a/tareas/tarea_3/busqueda_lineal/busqueda_lineal.cpp b/tareas/tarea_3/busqueda_lineal/busqueda_lineal.cpp
new file mode 100644
index 0000000..d87031e
--- /dev/null
+++ b/tareas/tarea_3/busqueda_lineal/busqueda_lineal.cpp
@@ -0,0 +1,47 @@
+#include <iostream>
+using namespace std;
+
+// --------- BUSQUEDA LINEAL ---------
+int busquedaLineal(int arr[], int n, int valor) {
+    for (int i = 0; i < n; i++) {
+        if (arr[i] == valor) {
+            return i; // retorna la posición donde se encontró
+        }
+    }
+    return -1; // no encontrado
+}
+
+// --------- MAIN ---------
+int main() {
+    int n, valor;
+    char repetir;
+
+    do {
+        cout << "\nCantidad de datos: ";
+        cin >> n;
+
+        int arr[1000];
+
+        cout << "Ingrese los datos:\n";
+        for (int i = 0; i < n; i++) {
+            cin >> arr[i];
+        }
+
+        cout << "\nIngrese el valor a buscar: ";
+        cin >> valor;
+
+        int resultado = busquedaLineal(arr, n, valor);
+
+        if (resultado != -1) {
+            cout << "Valor encontrado en la posicion: " << resultado << endl;
+        } else {
+            cout << "Valor no encontrado.\n";
+        }
+
+        cout << "\nDesea repetir? (s/n): ";
+        cin >> repetir;
+
+    } while (repetir == 's' || repetir == 'S');
+
+    return 0;
+}
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diff --git a/tareas/tarea_3/busqueda_lineal/busqueda_lineal.exe b/tareas/tarea_3/busqueda_lineal/busqueda_lineal.exe
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diff --git a/tareas/tarea_3/contar_hasta_10/contar_hasta_10.cpp b/tareas/tarea_3/contar_hasta_10/contar_hasta_10.cpp
new file mode 100644
index 0000000..32ca739
--- /dev/null
+++ b/tareas/tarea_3/contar_hasta_10/contar_hasta_10.cpp
@@ -0,0 +1,9 @@
+#include <iostream>
+using namespace std;
+
+int main() {
+    for (int i = 1; i <= 10; i++) {
+        cout << i << "\n";
+    }
+    return 0;
+}
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diff --git a/tareas/tarea_3/contar_hasta_10/contar_hasta_10.exe b/tareas/tarea_3/contar_hasta_10/contar_hasta_10.exe
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diff --git a/tareas/tarea_3/contar_vocales/contar_vocales.cpp b/tareas/tarea_3/contar_vocales/contar_vocales.cpp
new file mode 100644
index 0000000..99a010d
--- /dev/null
+++ b/tareas/tarea_3/contar_vocales/contar_vocales.cpp
@@ -0,0 +1,27 @@
+#include <iostream>
+using namespace std;
+int contarVocales(string texto) {
+    int contar = 0;
+    for (char x : texto) {
+        x = tolower(x);
+        if (x == 'a' || x == 'e' || x == 'i' || x == 'o' || x == 'u') {
+            contar++;
+        }
+    }
+    return contar;
+}
+int main() {
+    string oracion;
+    char continuar;
+    do {
+        cout << "ingrese una oracion: ";
+        getline(cin, oracion);
+        int total = contarVocales(oracion);
+        cout << "total de vocales: " << total << endl;
+        cout << "desea ingresar otra oracion? (s/n): ";
+        cin >> continuar;
+        cin.ignore(); 
+    } while (continuar == 's' || continuar == 'S');
+    cout << "programa terminado." << endl;
+    return 0;
+}
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diff --git a/tareas/tarea_3/contar_vocales/contar_vocales.exe b/tareas/tarea_3/contar_vocales/contar_vocales.exe
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diff --git a/tareas/tarea_3/numero_primo/numero_primo.cpp b/tareas/tarea_3/numero_primo/numero_primo.cpp
new file mode 100644
index 0000000..524ee00
--- /dev/null
+++ b/tareas/tarea_3/numero_primo/numero_primo.cpp
@@ -0,0 +1,29 @@
+#include <iostream>
+using namespace std;
+bool esprimo(int x) {
+    if (x <= 1) return false;
+    if (x == 2) return true;
+    for (int i = 2; i * i <= x; i++) {
+        if (x % i == 0) {
+            return false;
+        }
+    }
+    return true;
+}
+int main() {
+    int numero;
+    char continuar;
+    do {
+        cout << "ingrese un numero: ";
+        cin >> numero;
+        if (esprimo(numero)) {
+            cout << "primo" << endl;
+        } else {
+            cout << "no primo" << endl;
+        }
+        cout << "desea ingresar otro numero? (s/n): ";
+        cin >> continuar;
+    } while (continuar == 's' || continuar == 'S');
+    cout << "programa terminado." << endl;
+    return 0;
+}
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diff --git a/tareas/tarea_3/numero_primo/numero_primo.exe b/tareas/tarea_3/numero_primo/numero_primo.exe
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diff --git a/tareas/tarea_3/ordenamiento/ordenamiento.cpp b/tareas/tarea_3/ordenamiento/ordenamiento.cpp
new file mode 100644
index 0000000..a842863
--- /dev/null
+++ b/tareas/tarea_3/ordenamiento/ordenamiento.cpp
@@ -0,0 +1,99 @@
+#include <iostream>
+using namespace std;
+// bubble
+void bubble(int arr[], int n) {
+    for (int x = 0; x < n - 1; x++) {
+        for (int y = 0; y < n - x - 1; y++) {
+            if (arr[y] > arr[y + 1]) {
+                swap(arr[y], arr[y + 1]);
+            }
+        }
+    }
+}
+// seleccion
+void Selection(int arr[], int n) {
+    for (int x = 0; x < n - 1; x++) {
+        int min = x;
+        for (int y = x + 1; y < n; y++) {
+            if (arr[y] < arr[min]) {
+                min = y;
+            }
+        }
+        swap(arr[x], arr[min]);
+    }
+}
+// merge sort
+void merge(int arr[], int start, int medium, int end) {
+    int x = start, y = medium + 1, z = 0;
+    int temp[100]; 
+    while (x <= medium && y <= end) {
+        if (arr[x] < arr[y]) {
+            temp[z++] = arr[x++];
+        } else {
+            temp[z++] = arr[y++];
+        }
+    }
+    while (x <= medium) {
+        temp[z++] = arr[x++];
+    }
+    while (y <= end) {
+        temp[z++] = arr[y++];
+    }
+    for (int x = start, y = 0; x <= end; x++, y++) {
+        arr[x] = temp[y];
+    }
+}
+void mergesort(int arr[], int start, int end) {
+    if (start < end) {
+        int medium = (start + end) / 2;
+        mergesort(arr, start, medium);
+        mergesort(arr, medium + 1, end);
+        merge(arr, start, medium, end);
+    }
+}
+// --------- MOSTRAR ---------
+void mostrar(int arr[], int n) {
+    for (int x = 0; x < n; x++) {
+        cout << arr[x] << " ";
+    }
+    cout << endl;
+}
+// --------- MAIN ---------
+int main() {
+    int opcion, n;
+    char repetir;
+    do {
+        cout << "\nCantidad de datos: ";
+        cin >> n;
+        int arr[1000];
+        cout << "Ingrese los datos:\n";
+        for (int x = 0; x < n; x++) {
+            cin >> arr[x];
+        }
+        cout << "\nMetodos de ordenamiento:\n";
+        cout << "1. bubble\n";
+        cout << "2. Selection\n";
+        cout << "3. Merge Sort\n";
+        cout << "Elija una opcion: ";
+        cin >> opcion;
+        switch (opcion) {
+            case 1:
+                bubble(arr, n);
+                break;
+            case 2:
+                Selection(arr, n);
+                break;
+            case 3:
+                mergesort(arr, 0, n - 1);
+                break;
+            default:
+                cout << "Opcion invalida\n";
+                continue;
+        }
+        cout << "\nArreglo ordenado:\n";
+        mostrar(arr, n);
+        cout << "\nDesea repetir? (s/n): ";
+        cin >> repetir;
+    } while (repetir == 's' || repetir == 'S');
+    return 0;
+}
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diff --git a/tareas/tarea_3/ordenamiento/ordenamiento.exe b/tareas/tarea_3/ordenamiento/ordenamiento.exe
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diff --git a/tareas/tarea_3/suma_digitos/suma_digitos.cpp b/tareas/tarea_3/suma_digitos/suma_digitos.cpp
new file mode 100644
index 0000000..dcd22a8
--- /dev/null
+++ b/tareas/tarea_3/suma_digitos/suma_digitos.cpp
@@ -0,0 +1,21 @@
+#include <iostream>
+#include <cstdlib> 
+using namespace std;
+int main() {
+    char continuar;
+    do {
+        int x, suma = 0;
+        cout << " ingresa un numero entero: ";
+        cin >> x;
+        x = abs(x);
+        while (x > 0) {
+            suma += x % 10;
+            x /= 10;
+        }
+        cout << "La suma de los digitos es: " << suma << endl;
+        cout << "deseas volverlo a intentar? (s/n): ";
+        cin >> continuar;
+    } while (continuar == 's' || continuar == 'S');
+    cout << "programa terminado." << endl;
+    return 0;
+}
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diff --git a/tareas/tarea_3/suma_digitos/suma_digitos.exe b/tareas/tarea_3/suma_digitos/suma_digitos.exe
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