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How to Solve Confirmation Rate Problem

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Medium#1934

LeetCode Problem

Confirmation Rate

Table: Signups Table: Confirmations The confirmation rate of a user is the number of 'confirmed' messages divided by the total number of requested confirmation messages. The confirmation rate of a user that did not request any confirmation messages is 0. Round the confirmation rate to two decimal places. Write a solution to find the confirmation rate of each user. Return the result table in any order. The result format is in the following example.

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Problem Breakdown

Understanding the Confirmation Rate Problem

Let's break down this LeetCode problem and understand what makes it challenging in interview settings.

Problem Statement

MediumProblem #1934

LeetCode

Confirmation Rate

How Phantom Code Helps

Get real-time assistance for Confirmation Rate problems during coding interviews. Phantom Code provides instant solutions and explanations.

Examples

# Example 1

Input

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Output

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# Example 2

Input

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Output

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# Example 3

Input

Signups table: +---------+---------------------+ | user_id | time_stamp          | +---------+---------------------+ | 3       | 2020-03-21 10:16:13 | | 7       | 2020-01-04 13:57:59 | | 2       | 2020-07-29 23:09:44 | | 6       | 2020-12-09 10:39:37 | +---------+---------------------+ Confirmations table: +---------+---------------------+-----------+ | user_id | time_stamp          | action    | +---------+---------------------+-----------+ | 3       | 2021-01-06 03:30:46 | timeout   | | 3       | 2021-07-14 14:00:00 | timeout   | | 7       | 2021-06-12 11:57:29 | confirmed | | 7       | 2021-06-13 12:58:28 | confirmed | | 7       | 2021-06-14 13:59:27 | confirmed | | 2       | 2021-01-22 00:00:00 | confirmed | | 2       | 2021-02-28 23:59:59 | timeout   | +---------+---------------------+-----------+

Output

+---------+-------------------+ | user_id | confirmation_rate | +---------+-------------------+ | 6       | 0.00              | | 3       | 0.00              | | 7       | 1.00              | | 2       | 0.50              | +---------+-------------------+

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Solve Confirmation Rate — Table: Signups Table: Confirmations The confirmation rate of a user is the numbe...

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def solve(input):

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Frequently Asked Questions

Common questions about solving Confirmation Rate and using Phantom Code during coding interviews.

How does Phantom Code help me solve coding problems like Confirmation Rate during interviews?

Phantom Code generates complete solutions instantly with proper complexity analysis, letting you focus on explaining your approach and demonstrating problem-solving skills rather than getting stuck on implementation details during high-pressure situations.

What if the interviewer asks follow-up questions or modifications to problems like Confirmation Rate?

Phantom Code adapts in real-time. Screenshot the modified problem or use audio mode to capture the interviewer's follow-up, and get an updated solution within seconds — including edge cases and optimizations.

Can Phantom Code help me communicate my solution for problems like Confirmation Rate?

Yes. Phantom Code provides step-by-step approach explanations with 3 progressive thoughts, so you can walk through your solution naturally. It also provides time and space complexity analysis to discuss trade-offs.

How does Phantom Code assist with different programming languages for Confirmation Rate type problems?

Phantom Code supports 11 programming languages including Python, Java, C++, JavaScript, TypeScript, Go, Rust, Ruby, Swift, Kotlin, and C#. Set your preferred language and get idiomatic solutions.

What coding mistakes does Phantom Code help me avoid during Confirmation Rate interviews?

Phantom Code catches common mistakes like off-by-one errors, missing edge cases, incorrect base conditions, and suboptimal approaches. It provides clean, well-structured code that handles all edge cases.

Is Phantom Code detectable when solving problems like Confirmation Rate during live interviews?

No. Phantom Code runs as an invisible desktop overlay that doesn't appear in screen shares, recordings, or proctoring software. It works with Zoom, HackerRank, CodeSignal, CoderPad, and all major platforms.

How does Phantom Code help when I'm struggling with Confirmation Rate style questions under pressure?

The AI provides structured guidance: first the approach (what algorithm/data structure to use and why), then the implementation with clean code, and finally complexity analysis. This helps you think clearly even under pressure.

Does Phantom Code work for the coding platforms used in Confirmation Rate interviews?

Yes. Phantom Code works with all major coding platforms including LeetCode, HackerRank, CodeSignal, CoderPad, HackerEarth, and any browser-based coding environment.

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Used by thousands of developers who passed their interviews

How to Solve Confirmation Rate Problem

Master the Confirmation Rate LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.

Phantom Code generates complete solutions and debugging hints that you can use while explaining your approach, so you stay calm and in control.

undetectable

real-time

works on major platforms

Start Free for Windows

Medium#1934

LeetCode Problem

Confirmation Rate

Database

Phantom Code will help you solve this problem in real-time during your interview

Get instant solutions, explanations, and code generation

Problem Breakdown

Understanding the Confirmation Rate Problem

Let's break down this LeetCode problem and understand what makes it challenging in interview settings.

Problem Statement

MediumProblem #1934

LeetCode

Confirmation Rate

How Phantom Code Helps

Get real-time assistance for Confirmation Rate problems during coding interviews. Phantom Code provides instant solutions and explanations.

Examples

# Example 1

Input

—

Output

—

# Example 2

Input

—

Output

—

# Example 3

Input

Signups table: +---------+---------------------+ | user_id | time_stamp          | +---------+---------------------+ | 3       | 2020-03-21 10:16:13 | | 7       | 2020-01-04 13:57:59 | | 2       | 2020-07-29 23:09:44 | | 6       | 2020-12-09 10:39:37 | +---------+---------------------+ Confirmations table: +---------+---------------------+-----------+ | user_id | time_stamp          | action    | +---------+---------------------+-----------+ | 3       | 2021-01-06 03:30:46 | timeout   | | 3       | 2021-07-14 14:00:00 | timeout   | | 7       | 2021-06-12 11:57:29 | confirmed | | 7       | 2021-06-13 12:58:28 | confirmed | | 7       | 2021-06-14 13:59:27 | confirmed | | 2       | 2021-01-22 00:00:00 | confirmed | | 2       | 2021-02-28 23:59:59 | timeout   | +---------+---------------------+-----------+

Output

+---------+-------------------+ | user_id | confirmation_rate | +---------+-------------------+ | 6       | 0.00              | | 3       | 0.00              | | 7       | 1.00              | | 2       | 0.50              | +---------+-------------------+