export type Option = string;
export declare class UCB {
    options: Option[];
    explorationFactor: number;
    pulls: number[];
    rewards: number[];
    totalPulls: number;
    totalRewards: number;
    optionToIndex: {
        [option: string]: number;
    };
    constructor(options: Option[], explorationFactor: number);
    pull(option: Option): void;
    reward(option: Option, reward: number): void;
    optionToMean(option: Option): number;
    optionToUCB(option: Option): number;
    rankedOptions(): string[];
}