[GESP202306 一级] 累计相加

{
  "problem": {
    "name": "[GESP202306 一级] 累计相加",
    "description": {
      "content": "输入一个正整数 $n$，求形如： $1+(1+2)+(1+2+3)+(1+2+3+4)+ \\cdots  +(1+2+3+4+5+ \\cdots  +n)$ 的累计相加。",
      "description_type": "Markdown"
    },
    "platform": "Luogu",
    "limit": {
      "time_limit": 1000,
      "memory_limit": 131072
    },
    "difficulty": {
      "LuoguStyle": "P1"
    },
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "LGB3839"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "输入一个正整数 $n$，求形如：\n\n$1+(1+2)+(1+2+3)+(1+2+3+4)+ \\cdots  +(1+2+3+4+5+ \\cdots  +n)$ 的累计相加。\n\n## Input\n\n输入一个正整数 $n$。约定 $1<n \\le 100$。\n\n## Output\n\n输出累计相加的结果。\n\n[samples]\n\n## Background\n\n对应的选择、判断题：<https://ti....",
      "is_translate": false,
      "language": "English"
    }
  ]
}