POJ 3622 Gourmet Grazers

Description

Like so many others, the cows have developed very haughty tastes and will no longer graze on just any grass. Instead, Farmer John must purchase gourmet organic grass at the Green Grass Grocers store for each of his N (1 ≤ N ≤ 100,000) cows.

Each cow i demands grass of price at least A_i (1 ≤ A_i ≤ 1,000,000,000) and with a greenness score at least B_i (1 ≤ B_i ≤ 1,000,000,000). The GGG store has M (1 ≤ M ≤ 100,000) different types of grass available, each with a price C_i (1 ≤ C_i ≤ 1,000,000,000) and a greenness score of D_i (1 ≤ D_i ≤ 1,000,000,000). Of course, no cow would sacrifice her individualit

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