What is the conflict and resolution of The Hunger Games?
The primary conflict in The Hunger Games is Katniss's struggle to survive the Capitol's "entertaining" annual Hunger Games for which she has volunteered to enter in an effort to save her younger sister. When Prim's name is originally chosen, Katniss instinctively pushes her young sister behind her, knowing that she could never survive the brutality ahead.
Thus, she is forced to engage in a fight for her life. Only one victor will come out of the arena, the others being forced to kill each other if they aren't killed by the Gamemakers. Although the overarching conflict is Katniss versus society (particularly her government), there are subplots of conflict: person versus nature (fire, tracker jackers) and person versus person (Cato, Foxface) are elements that are present once she is inside the arena. Ultimately, all of the conflict she faces is a direct result of her government's controlling arm.
The immediate conflict is resolved when Katniss and Peeta threaten to commit suicide via nightlock berries—thus allowing no victor to emerge from the arena and overthrowing the government's plans. They are both immediately crowned victors and allowed to leave the arena.
However, it is immediately clear that Katniss and Peeta's move is seen as direct defiance of the Capitol, which cannot be tolerated, and the conflict between Katniss and her government continues into the next book in the series.