Ensure availability and sustainable management of water and sanitation for all
Target
6.1
By 2030, achieve universal and equitable access to safe and affordable drinking water for all
Target
6.3
By 2030, improve water quality by reducing pollution, eliminating dumping and minimizing release of hazardous chemicals and materials, halving the proportion of untreated wastewater and substantially increasing recycling and safe reuse globally
Task: Answer the question and draw a path in the lock representing answer number. The way you will enter your answer is shown on the right below.
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Background: while solving algorithmic problem, you need to carefully consider all special cases, possibilities and restrictions.