Does the resolution of a story always have to solve the conflict or have a happy ending?

No, the resolution of a story doesn't always have to solve the conflict or provide a happy ending. Some narratives intentionally leave conflicts unresolved or conclude with a more ambiguous or tragic outcome to evoke deeper emotional responses or provoke thought. This approach can add complexity to characters and themes, reflecting the realities of life where not all conflicts have neat resolutions. Ultimately, the resolution should align with the story's overall message and tone.