https://omegaup.com/arena/problem/Ignorando-los-primeros-elementos
https://omegaup.com/arena/problem/Ignorando-los-ultimos-elementos
https://omegaup.com/arena/problem/Reverso
https://omegaup.com/arena/problem/Secuencias-iguales
https://omegaup.com/arena/problem/Buscar-y-contar
https://omegaup.com/arena/problem/Suma-de-vectores
https://omegaup.com/arena/problem/Imprimiendo-enteros-por-paridad
https://omegaup.com/arena/problem/Sumando-arreglos-por-los-extremo