[蓝桥杯 2018 省 B] 递增三元组

{
  "problem": {
    "name": "[蓝桥杯 2018 省 B] 递增三元组",
    "description": {
      "content": "给定三个整数数组 $A = [A_1, A_2,\\cdots, A_N]$，$B = [B_1, B_2,\\cdots, B_N]$，$C = [C_1, C_2,\\cdots,C_N]$。 请你统计有多少个三元组 $(i, j, k)$ 满足： 1. $1 \\le i, j, k \\le N$   2. $A_i < B_j < C_k$",
      "description_type": "Markdown"
    },
    "platform": "Luogu",
    "limit": {
      "time_limit": 1000,
      "memory_limit": 262144
    },
    "difficulty": {
      "LuoguStyle": "P3"
    },
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "LGP8667"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "给定三个整数数组 $A = [A_1, A_2,\\cdots, A_N]$，$B = [B_1, B_2,\\cdots, B_N]$，$C = [C_1, C_2,\\cdots,C_N]$。\n\n请你统计有多少个三元组 $(i, j, k)$ 满足：\n1. $1 \\le i, j, k \\le N$  \n2. $A_i < B_j < C_k$\n\n## Input\n\n第一行包含一个整数 $N$。\n\n...",
      "is_translate": false,
      "language": "English"
    }
  ]
}