This problem is in Contest(s) below:
Contest 59:202503GESP二级模拟测——1
Contest 91:202506GESP二级模拟测——1
Contest 126:2025暑期集训初级-Day1
Contest 223:202512GESP二级模拟测——1
Contest 38:GESP二级第一次模拟测试