# Suggested problems

## STP for residential buildings

Sept. 21, 2021, 4:24 a.m. by AmitS0007

## Biological Motivation

STP for residential buildings Indian residential societies are critical tackling water pollution across urban India. In 2019, the central government conducted water quality tests on 21 cities across 13 states of India. Out of these, only one city-Mumbai managed to pass on all parameters while others failed on at least one criterion.

Residential societies now face stricter rules for sewage treatment than they did five years ago. In cities such as Mumbai, new buildings are permitted on the condition that they treat their solid waste in-house. Efficient, durable, and reliable water treatment is thus a necessity for modern residential societies.

How is a sewage treatment plant helpful for residential societies? Treating the wastewater from apartment complexes benefits public health, environment, as well as economy and ecology of the residential complex, improving the quality of life for residents.

Treated wastewater can be reused for activities such as gardening, washing cars, toilet flushing It improves the water availability and also recharges the groundwater table of the surrounding area Improved compliance with environmental regulations Reduced water pollution when treated water is released into the city’s water bodies Meeting the operational challenges in residential societies Residential buildings typically have limited space for the installation of STPs. Another major challenge is the elimination of foul smells which might antagonize the residents to the STP.

Inovar has special expertise in designing compact STPs that fit space constraints. Additionally, our STPs come with a guaranteed complete elimination of foul smells. For the past 5+ years, Inovar has been addressing the most pressing operations issues of STPs in residential societies.

Energy efficiency Energy costs are perhaps the largest expanses in operating an STP. 50%-60% of the plant’s total energy is used in treating biological waste. Inovar uses fine screens and membrane technology to cut energy consumption and make the plant an affordable solution for residential societies.

Sludge generation The physical, chemical, and biological treatment of water generates sludge. The disposal of excess sludge often presents a problem for residential societies. Inovar’s technology enables easy recycling of sludge containing useful organic matter. This matter can then be processed into manure for plants.

Maintenance Operating a wastewater treatment plant generally requires a trained person. Operating an STP becomes even more demanding during times such as seasonal changes, or changes in influent. Inovar provides highly automated STPs which reduce the strain on the maintenance staff of the plant. Further on, Inovar STPs are backed by Annual Maintenance Contracts which ensure prompt repair and maintenance for your plant year after year.

STP-regulations-from-2019-for-all-major-cities_table. Conclusion Going beyond compliance needs, considerations such as costs, service life, and efficiency impact the choice of a sewage treatment plant for a residential building. The expert team from Inovar works closely with customers to understand their needs. Our STPs have a proven track record of meeting the most stringent environmental norms while delivering consistent operational performance over long periods of time.

We provide end-to-end solutions for sewage treatment plants including process design, engineering design, feasibility studies, project management, and more. Apart from the design and manufacturing of customized ETPs, Inovar also offers consultancy services to optimize the potential of your existing plant.

## Problem

A string is simply an ordered collection of symbols selected from some alphabet and formed into a word; the length of a string is the number of symbols that it contains.

An example of an DNA string (whose alphabet contains the symbols A, C, G, and T) is ATGCTTCAGAAAGGTCTTACG.

Given: A DNA string $s$ of length at most 1000 nucleotides.

Return: Four integers corresponding to the number of times that the symbols A, C, G, and T occur in $s$.

## Sample Dataset

AGCTTTTCATTCTGACTGCAACGGGCAATATGTCTCTGTGTGGATTAAAAAAAGAGTGTCTGATAGCAGC


## Sample Output

20 12 17 21