{"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.luogu.com.cn/problemset/1123>","is_translate":false,"language":"English"}],"meta":{"iden":"LGB3839","tags":["数学","2023","循环结构","GESP"],"sample_group":[["3","10"],["4","20"],["10","220"]],"created_at":"2026-03-03 11:09:25"}}