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Suppose we have a list of strings called orders. Each element in the orders list starts with either "P" or "D". The "P" indicates that is picked up, and "D" means "delivery". And these letters are followed by the order id number. For example, "P6" indicates pick up order 6. We have to check whether orders list is valid or not based on these rules −We cannot delivery an order before pickupEvery pickup must be deliveredAn order which is already been picked up and also delivered cannot be picked up or delivered againSo, if the input is like orders = ... Read More
Suppose we have a list of heights of different buildings. A building with heights value heights[i] can see the ocean when every building on its right are shorter than that building. We have to find the building indices from where we can see the ocean, in ascending order.So, if the input is like heights = [8, 12, 12, 9, 10, 6], then the output will be [2, 4, 5] because we can see the ocean from building heights 12 at index 2, from building height 10 at index 10 and from last building at index 5.To solve this, we will ... Read More
Suppose we have a list of mail ids in a constants list. So for each row there may be more than one mail id of same person. The contact i is considered as duplicate when there's any j, where j < i such that contact j shares a common email with i. So we have to find the number of unique people in contacts.So, if the input is like contacts = [["alex@gmail.com", "alex@yahoo.com"], ["alex_25@yahoo.com", "alex@gmail.com"], ["bob15@gmail.com"] ], then the output will be 2, as the first and second contacts are sharing same mail ids, so they are same person, so ... Read More
Suppose we have a matrix character board. Where each cell is holding a character. We also have a string called target, we have to check whether the target can be found in the matrix by going left-to-right, or up-to-down unidirectional way, or not.So, if the input is likeantsspinlapsWord = “tip”then the output will be True, you can see the third column (top to bottom) is forming "tip".To solve this, we will follow these steps −for each i in board, doi := make word from characters present in iif word is present in i, thenreturn Truei := 0while i < row ... Read More
To get the maximum value from Ordered CategoricalIndex, use the catIndex.max() method in Pandas.At first, import the required libraries −import pandas as pdSet the categories for the categorical using the "categories" parameter. Treat the categorical as ordered using the "ordered" parameter −catIndex = pd.CategoricalIndex( ["p", "q", "r", "s", "p", "q", "r", "s"], ordered=True, categories=["p", "q", "r", "s"] )Display the Categorical Index −print("Categorical Index...", catIndex)Get the max value −print("Maximum value from CategoricalIndex...", catIndex.max())ExampleFollowing is the code −import pandas as pd # CategoricalIndex can only take on a limited, and usually fixed, number of possible values. # Set the categories ... Read More
To get the minimum value from Ordered CategoricalIndex, use the catIndex.min() method in Pandas. At first, import the required libraries −import pandas as pdSet the categories for the categorical using the "categories" parameter. Treat the categorical as ordered using the "ordered" parameter −catIndex = pd.CategoricalIndex( ["p", "q", "r", "s", "p", "q", "r", "s"], ordered=True, categories=["p", "q", "r", "s"] )Display the Categorical Index −print("Categorical Index...", catIndex)Get the min value −print("Minimum value from CategoricalIndex...", catIndex.min())ExampleFollowing is the code −import pandas as pd # CategoricalIndex is the Index based on an underlying Categorical # Set the categories for the categorical using ... Read More
Suppose we have a list of numbers called nums, that is representing stock prices of a company in chronological order. We can buy at most one share of stock per day, but you can hold onto multiple stocks and can sell stocks on any number of days. Return the maximum profit you can earn.So, if the input is like nums = [3, 4, 7, 3, 5], then the output will be 9, because we can buy the stocks at 3 and 4 and sell them at 7. Then again buy at 3 and sell at 5. Total profit (7 - ... Read More
To create an Index based on an underlying Categorical, use the pandas.CategoricalIndex() method.At first, import the required libraries −import pandas as pdCategoricalIndex is the Index based on an underlying Categorical. CategoricalIndex can only take on a limited, and usually fixed, number of possible values. Set the categories for the categorical using the "categories" parameter. Treat the categorical as ordered using the "ordered" parameter −catIndex = pd.CategoricalIndex( ["p", "q", "r", "s", "p", "q", "r", "s"], ordered=True, categories=["p", "q", "r", "s"] )Display the Categorical Index −print("Categorical Index...", catIndex)Get the categories −print("DisplayingCategories from CategoricalIndex...", catIndex.categories)ExampleFollowing is the code −import pandas as pd ... Read More
To create RangeIndex from a range object, use the pd.RangeIndex.from_range(range()) method in Pandas.At first, import the required libraries −import pandas as pdCreate RangeIndex −index = pd.RangeIndex.from_range(range(10, 30)) Display the RangeIndex −print("RangeIndex...",index)ExampleFollowing is the code −import pandas as pd # RangeIndex index = pd.RangeIndex.from_range(range(10, 30)) # Display the RangeIndex print("RangeIndex...",index) # Display the start value print("RangeIndex start value...",index.start) # Display the end value print("RangeIndex end value...",index.stop)OutputThis will produce the following output −RangeIndex... RangeIndex(start=10, stop=30, step=1) RangeIndex start value... 10 RangeIndex end value... 30
Suppose we have a list of integers called tasks where each item represents a different task type, we also have a non-negative integer say k. Each task takes one unit of time to complete and the tasks must be completed in correct order, but we must have k units of time between doing two same type tasks. At any time, either we can do a task or wait. We have to find the amount of time it takes to complete all the tasks.So, if the input is like tasks = [0, 1, 1, 2] k = 2, then the output ... Read More