{"problem":{"name":"Picking Goods","description":{"content":"There are $K$ items placed on a grid of squares with $R$ rows and $C$ columns. Let $(i, j)$ denote the square at the $i$\\-th row ($1 \\leq i \\leq R$) and the $j$\\-th column ($1 \\leq j \\leq C$). The $i$","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":3000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"abc175_e"},"statements":[{"statement_type":"Markdown","content":"There are $K$ items placed on a grid of squares with $R$ rows and $C$ columns. Let $(i, j)$ denote the square at the $i$\\-th row ($1 \\leq i \\leq R$) and the $j$\\-th column ($1 \\leq j \\leq C$). The $i$\\-th item is at $(r_i, c_i)$ and has the value $v_i$.\nTakahashi will begin at $(1, 1)$, the start, and get to $(R, C)$, the goal. When he is at $(i, j)$, he can move to $(i + 1, j)$ or $(i, j + 1)$ (but cannot move to a non-existent square).\nHe can pick up items on the squares he visits, including the start and the goal, but at most three for each row. It is allowed to ignore the item on a square he visits.\nFind the maximum possible sum of the values of items he picks up.\n\n## Constraints\n\n*   $1 \\leq R, C \\leq 3000$\n*   $1 \\leq K \\leq \\min(2 \\times 10^5, R \\times C)$\n*   $1 \\leq r_i \\leq R$\n*   $1 \\leq c_i \\leq C$\n*   $(r_i, c_i) \\neq (r_j, c_j) (i \\neq j)$\n*   $1 \\leq v_i \\leq 10^9$\n*   All values in input are integers.\n\n## Input\n\nInput is given from Standard Input in the following format:\n\n$R$ $C$ $K$\n$r_1$ $c_1$ $v_1$\n$r_2$ $c_2$ $v_2$\n$:$\n$r_K$ $c_K$ $v_K$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"abc175_e","tags":[],"sample_group":[["2 2 3\n1 1 3\n2 1 4\n1 2 5","8\n\nHe has two ways to get to the goal:\n\n*   Visit $(1, 1)$, $(1, 2)$, and $(2, 2)$, in this order. In this case, the total value of the items he can pick up is $3 + 5 = 8$.\n*   Visit $(1, 1)$, $(2, 1)$, and $(2, 2)$, in this order. In this case, the total value of the items he can pick up is $3 + 4 = 7$.\n\nThus, the maximum possible sum of the values of items he picks up is $8$."],["2 5 5\n1 1 3\n2 4 20\n1 2 1\n1 3 4\n1 4 2","29\n\nWe have four items in the $1$\\-st row. The optimal choices are as follows:\n\n*   Visit $(1, 1)$ $(1, 2)$, $(1, 3)$, $(1, 4)$, $(2, 4)$, and $(2, 5)$, in this order, and pick up all items except the one on $(1, 2)$. Then, the total value of the items he picks up will be $3 + 4 + 2 + 20 = 29$."],["4 5 10\n2 5 12\n1 5 12\n2 3 15\n1 2 20\n1 1 28\n2 4 26\n3 2 27\n4 5 21\n3 5 10\n1 3 10","142"]],"created_at":"2026-03-03 11:01:14"}}