Bitcoin, as a new mean of circulation, has a great impact on gold market. The investment of Bitcoin and Gold has recently attracted intensive attention from financial institutions, and the capital markets. This paper proposes an investment strategy based on Title C of the 2022 Mathematical Contest. This paper establishes an LSTM time series forecasting model. After data processing and training with indicators such as MACD as features, a forecasting model and the predicted data are obtained. For the decision strategy, this paper builds a model that seeks the maximum return as well as the minimum risk based on Markowitz portfolio investment theory and Sharpe ratio. Calculated by genetic algorithm, the final return are calculated to be 207,612.96 USD.
At present, China's construction industry is developing continuously. With the maturity and perfection of the supply chain, accurate supplier evaluation and selection methods are of great strategic significance. On the basis of Title C of the 2021 National Mathematical Modeling Competition, this paper studies the selection of important building material suppliers. As the analytic hierarchy process assigns the weight of each evaluation index, the evaluation model is established according to technology for order preference by similarity to an ideal solution and grey comprehensive evaluation method. By calculating the importance of each supplier, the top 50 building materials suppliers headed by S229, S140 are analyzed and selected. Based on the model and results, this paper gives suggestions for improvement of strategic decision.
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