Home
Problem
Status
Contest
Workbook
User
Group
Forum
Register
Login
{"managingGroups":{},"author":"18liyong","updateTime":1556611554000,"title":"快速求1到n之间的和","dislikeCnt":28,"content":"```\n#include \u003ciostream\u003e\n\nusing namespace std;\n\nint main()\n{\n int n,sum\u003d0;\n cin\u003e\u003en;\n sum\u003dn*(n+1)/2;\n cout\u003c\u003csum\u003c\u003cendl;\n return 0;\n}\n\n```","threadId":47145,"likeCnt":9,"createTime":1556611356000,"isWorkbook":false,"viewCnt":2043,"openness":2,"fav":false,"id":1079,"trustable":false}