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Hello Programmers/Coders, Today we are going to share solutions to the Programming problems of LeetCode Solutions in C++, Java, & Python. At Each Problem with Successful submission with all Test Cases Passed, you will get a score or marks and LeetCode Coins. And after solving maximum problems, you will be getting stars. This will highlight your profile to the recruiters.
In this post, you will find the solution for the Delete Duplicate Email in C++, Java & Python-LeetCode problems. We are providing the correct and tested solutions to coding problems present on LeetCode. If you are not able to solve any problem, then you can take help from our Blog/website.
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About LeetCode
LeetCode is one of the most well-known online judge platforms to help you enhance your skills, expand your knowledge and prepare for technical interviews.
LeetCode is for software engineers who are looking to practice technical questions and advance their skills. Mastering the questions in each level on LeetCode is a good way to prepare for technical interviews and keep your skills sharp. They also have a repository of solutions with the reasoning behind each step.
LeetCode has over 1,900 questions for you to practice, covering many different programming concepts. Every coding problem has a classification of either Easy, Medium, or Hard.
LeetCode problems focus on algorithms and data structures. Here is some topic you can find problems on LeetCode:
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Leetcode has a huge number of test cases and questions from interviews too like Google, Amazon, Microsoft, Facebook, Adobe, Oracle, Linkedin, Goldman Sachs, etc. LeetCode helps you in getting a job in Top MNCs. To crack FAANG Companies, LeetCode problems can help you in building your logic.
Link for the Problem – Delete Duplicate Email– LeetCode Problem
Template – LeetCode Problem
Problem:
Table: Person
+-------------+---------+ | Column Name | Type | +-------------+---------+ | id | int | | email | varchar | +-------------+---------+ id is the primary key column for this table. Each row of this table contains an email. The emails will not contain uppercase letters.
Write an SQL query to delete all the duplicate emails, keeping only one unique email with the smallest id
. Note that you are supposed to write a DELETE
statement and not a SELECT
one.
After running your script, the answer shown is the Person
table. The driver will first compile and run your piece of code and then show the Person
table. The final order of the Person
table does not matter.
The query result format is in the following example.
Example 1:
Input: Person table: +----+------------------+ | id | email | +----+------------------+ | 1 | john@example.com | | 2 | bob@example.com | | 3 | john@example.com | +----+------------------+ Output: +----+------------------+ | id | email | +----+------------------+ | 1 | john@example.com | | 2 | bob@example.com | +----+------------------+ Explanation: john@example.com is repeated two times. We keep the row with the smallest Id = 1.
Delete Duplicate Email– LeetCode Solutions
Delete Duplicate Email Solution in SQL:
First Problem solution.
delete from Person where Id in (select r.Id from (select Id, row_number() over(partition by Email order by Id ) as rk from Person) r where r.rk > 1 );
Second Problem solution.
DELETE b FROM Person a, Person b WHERE a.Email = b.Email AND a.Id < b.Id;
Third Problem solution.
delete from Person where Id not in (select mid from (select min(Id) as mid from Person group by Email)T )
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¿ Has percibido alguna vez temblores inusuales en un equipo industrial? ¿O sonidos fuera de lo común? Muchas veces, el problema está en algo tan básico como una falta de simetría en un elemento móvil. Y créeme, ignorarlo puede costarte bastante dinero .
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¿Por qué es tan importante equilibrar las piezas?
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Paradas sin programar seguidas de gastos elevados
En resumen: si no se corrige a tiempo, un pequeño desequilibrio puede convertirse en un gran dolor de cabeza .
Métodos de equilibrado: cuál elegir
No todos los casos son iguales. Dependiendo del tipo de pieza y su uso, se aplican distintas técnicas:
Equilibrado dinámico
Ideal para piezas que giran a alta velocidad, como rotores o ejes . Se realiza en máquinas especializadas que detectan el desequilibrio en múltiples superficies . Es el método más exacto para asegurar un movimiento uniforme .
Equilibrado estático
Se usa principalmente en piezas como neumáticos, discos o volantes de inercia. Aquí solo se corrige el peso excesivo en una única dirección. Es rápido, sencillo y eficaz para ciertos tipos de maquinaria .
Corrección del desequilibrio: cómo se hace
Taladrado selectivo: se elimina material en la zona más pesada
Colocación de contrapesos: tal como en neumáticos o perfiles de poleas
Ajuste de masas: habitual en ejes de motor y partes relevantes
Equipos profesionales para detectar y corregir vibraciones
Para hacer un diagnóstico certero, necesitas herramientas precisas. Hoy en día hay opciones accesibles y muy efectivas, como :
✅ Balanset-1A — Tu aliado portátil para equilibrar y analizar vibraciones
El Equilibrado de Piezas: Clave para un Funcionamiento Eficiente
¿Alguna vez has notado vibraciones extrañas en una máquina? ¿O tal vez ruidos que no deberían estar ahí? Muchas veces, el problema está en algo tan básico como un desequilibrio en alguna pieza rotativa . Y créeme, ignorarlo puede costarte caro .
El equilibrado de piezas es un procedimiento clave en la producción y cuidado de equipos industriales como ejes, volantes, rotores y partes de motores eléctricos . Su objetivo es claro: prevenir movimientos indeseados capaces de generar averías importantes con el tiempo .
¿Por qué es tan importante equilibrar las piezas?
Imagina que tu coche tiene una llanta mal nivelada . Al acelerar, empiezan las vibraciones, el volante tiembla, e incluso puedes sentir incomodidad al conducir . En maquinaria industrial ocurre algo similar, pero con consecuencias mucho más graves :
Aumento del desgaste en bearings y ejes giratorios
Sobrecalentamiento de componentes
Riesgo de fallos mecánicos repentinos
Paradas sin programar seguidas de gastos elevados
En resumen: si no se corrige a tiempo, un pequeño desequilibrio puede convertirse en un gran dolor de cabeza .
Métodos de equilibrado: cuál elegir
No todos los casos son iguales. Dependiendo del tipo de pieza y su uso, se aplican distintas técnicas:
Equilibrado dinámico
Perfecto para elementos que operan a velocidades altas, tales como ejes o rotores . Se realiza en máquinas especializadas que detectan el desequilibrio en múltiples superficies . Es el método más fiable para lograr un desempeño estable.
Equilibrado estático
Se usa principalmente en piezas como ruedas, discos o volantes . Aquí solo se corrige el peso excesivo en una sola superficie . Es rápido, fácil y funcional para algunos equipos .
Corrección del desequilibrio: cómo se hace
Taladrado selectivo: se elimina material en la zona más pesada
Colocación de contrapesos: como en ruedas o anillos de volantes
Ajuste de masas: típico en bielas y elementos estratégicos
Equipos profesionales para detectar y corregir vibraciones
Para hacer un diagnóstico certero, necesitas herramientas precisas. Hoy en día hay opciones disponibles y altamente productivas, por ejemplo :
✅ Balanset-1A — Tu asistente móvil para analizar y corregir oscilaciones
Equilibrar rápidamente
Equilibrado dinámico portátil:
Reparación ágil sin desensamblar
Imagina esto: tu rotor inicia con movimientos anormales, y cada minuto de inactividad cuesta dinero. ¿Desmontar la máquina y esperar días por un taller? Ni pensarlo. Con un equipo de equilibrado portátil, resuelves sobre el terreno en horas, sin alterar su posición.
¿Por qué un equilibrador móvil es como un “herramienta crítica” para máquinas rotativas?
Compacto, adaptable y potente, este dispositivo es una pieza clave en el arsenal del ingeniero. Con un poco de práctica, puedes:
✅ Corregir vibraciones antes de que dañen otros componentes.
✅ Reducir interrupciones no planificadas.
✅ Actuar incluso en sitios de difícil acceso.
¿Cuándo es ideal el equilibrado rápido?
Siempre que puedas:
– Acceder al rotor (eje, ventilador, turbina, etc.).
– Colocar sensores sin interferencias.
– Ajustar el peso (añadiendo o removiendo masa).
Casos típicos donde conviene usarlo:
La máquina rueda más de lo normal o emite sonidos extraños.
No hay tiempo para desmontajes (operación prioritaria).
El equipo es costoso o difícil de detener.
Trabajas en zonas remotas sin infraestructura técnica.
Ventajas clave vs. llamar a un técnico
| Equipo portátil | Servicio externo |
|—————-|——————|
| ✔ Rápida intervención (sin demoras) | ❌ Demoras por agenda y logística |
| ✔ Mantenimiento proactivo (previenes daños serios) | ❌ Suele usarse solo cuando hay emergencias |
| ✔ Ahorro a largo plazo (menos desgaste y reparaciones) | ❌ Gastos periódicos por externalización |
¿Qué máquinas se pueden equilibrar?
Cualquier sistema rotativo, como:
– Turbinas de vapor/gas
– Motores industriales
– Ventiladores de alta potencia
– Molinos y trituradoras
– Hélices navales
– Bombas centrífugas
Requisito clave: hábitat adecuado para trabajar con precisión.
Tecnología que simplifica el proceso
Los equipos modernos incluyen:
Aplicaciones didácticas (para usuarios nuevos o técnicos en formación).
Evaluación continua (informes gráficos comprensibles).
Durabilidad energética (útiles en ambientes hostiles).
Ejemplo práctico:
Un molino en una mina mostró movimientos inusuales. Con un equipo portátil, el técnico localizó el error rápidamente. Lo corrigió añadiendo contrapesos y evitó una parada de 3 días.
¿Por qué esta versión es más efectiva?
– Estructura más dinámica: Organización visual facilita la comprensión.
– Enfoque práctico: Incluye casos ilustrativos y contrastes útiles.
– Lenguaje persuasivo: Frases como “recurso vital” o “minimizas riesgos importantes” refuerzan el valor del servicio.
– Detalles técnicos útiles: Se especifican requisitos y tecnologías modernas.
¿Necesitas ajustar el tono (más comercial) o añadir keywords específicas? ¡Aquí estoy para ayudarte! ️