I’m practicing my coding skills and I was solving the following backtracking problem (the solution of the original guide is in there as well) Summary of the problem: Given a string you need to print all possible strings that can be made by placing spaces (zero or one) in between them. My solution is the ..

#### Category : backtracking

Here’s the output that it returns when I call it from the main function by passing args: 0 and board where 0 is the row number to start from and board is a 4×4 board filled with zeros: 9 1 1 1 1 1 9 1 1 1 1 1 1 0 1 1 Note: ..

Two strings s1 and s2 are Twiddles if they have the same length and each character in the same position differs by at most 2. For instance, "eschew" and "craggy" are Twiddles as the differences between consecutive characters are respectively -2, -1, -2, -1, 2, 2. I’m trying to write a function listTwiddles that takes ..

A problem I was given requires us to solve using a backtracking style algorithm. I wrote one based upon a given solution to a similar problem, but I need it to be faster (run all test cases in under 3 seconds.) The problem statement is as follows: Given two numbers n and k, determine the ..

I am trying to solve the Leetcode question 489. Robot Room Cleaner using backtracking. Specifically, I try to move the robot in each of 4 directions and backtrack if all four directions are blocked or cleaned. The code below doesn’t work and I am trying to debug it with this simple example: grid = [[1,1,1], ..

I’m testing my app, which has a lot of C++, in debug. Even though it’s compiled in debug, and the C++ code is compiled by my own app (thus is compiled in debug mode also), I get crash backtraces like this: 09-23 19:16:32.672 14123 14123 F DEBUG : Build fingerprint: ‘motorola/griffin/griffin:8.0.0/OPL27.76-71-2-3/3:user/release-keys’ 09-23 19:16:32.672 14123 14123 ..

vector<vector<int>> subsets(vector<int>& nums) { vector<vector<int>>subset; vector<int>v; dfs(subset,0,nums,v); return subset; } void dfs(vector<vector<int>> subset, int index, vector<int>&nums, vector<int>&v){ subset.push_back(v); for(int i=index;i<nums.size();i++) { v.push_back(nums[i]); dfs(subset,i+1,nums,v); v.pop_back(); } } Why is the above code for printing the powerset of a set of integers, giving wrong answer? Actually, it is only printing empty set. What mistake am I making? ..

Initially my algorithm involved testing every number from 1->n of an nxn sudoku but since it couldn’t solve 16×16 sudokus (had the algorithm running for 3 hours with no luck) I thought it would be better to choose numbers in a cell based on the most valid and least used number on the board. I ..

I am getting a infinite loop when I try and run my solution for the Knights Tour problem using Backtracking My Solution Code: Link: https://ideone.com/Ud92vF code: #include <bits/stdc++.h> using namespace std; bool valid(int arr[8][8],int r,int c) { if(r>=0 and r<8 and c>=0 and c<8 and arr[r][c]== -1) return true; return false; } void fun(int arr[8][8],int ..

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