[ABC177C] 数对乘积之和（Sum of product of pairs）

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	DH-LZR	800ms	3.6 MiB	C++14(O2)	291 Bytes	2026-2-26 16:23:05
AC	许皓辰	808ms	1.3 MiB	C++14(O2)	322 Bytes	2026-2-24 14:47:07
AC	方一帆2	1038ms	2.6 MiB	C++14(O2)	696 Bytes	2025-11-29 12:32:37
AC	jike1994	1141ms	1.3 MiB	C++14(O2)	383 Bytes	2025-10-28 16:01:42