Codeforces will not be available in the period 01:00-05:00 May, 30 (MSK, UTC +3) because of maintenance. ×

forget_it's blog

By forget_it, history, 2 months ago, In English,

Please tell me how to approach grid based problems ,especially regarding counting of possible ways to do something.

Is there any algos related to it, please list them.. Any Study material related to these type of problems will help .

for eg. problems like (from codejam):

Problem 1

Problem 2

  • Vote: I like it
  • 0
  • Vote: I do not like it

2 months ago, # |
  Vote: I like it -8 Vote: I do not like it

Grid Problems generally require you to know how to represent graphs and the dfs, bfs algorithms. But the given Code Jam Problem does not involve dfs. That's all i know so far.

2 months ago, # |
  Vote: I like it 0 Vote: I do not like it

I don't think this is a good angle to look at this, as if there is some "list of approaches" for "grid problems". The problem you linked is a very ad-hoc one with a constructive solution: solving process is more like trying different patterns with some experience.

  • »
    2 months ago, # ^ |
    Rev. 2   Vote: I like it 0 Vote: I do not like it

    Any Suggesstion ,how to prepare for codejam round 1 , i looked for past year paper , and problem 1 was the first problem of 2019 contest , i found it tough.

    On average i need to score 50+ score in order to qualify this round.