Q: What kind of contribution to previous research can merit a new paper?

Detailed Question -

I am a researcher in Computer Science.I want to know about the extent of my contribution in a paper in my field. For example, if I change the previous published algorithm a little bit in order to find if I can get better results or not,  can this be considered as contribution? I heard that some researchers in the field of chemistry conduct a new experiment by changing the input material of an already published experiment. They then publish a new paper on this without any issue. Even, changing input can be considered as contribution. Can I know what we can explain as contribution?

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