View Compilation Error

0_0_30274372_23530.cpp
0_0_30274372_23530.cpp(22) : error C3861: “isdigit”:  找不到标识符
0_0_30274372_23530.cpp(23) : error C3861: “isdigit”:  找不到标识符
0_0_30274372_23530.cpp(101) : error C2143: 语法错误 : 缺少“;”(在“for”的前面)
0_0_30274372_23530.cpp(101) : error C2664: “void scan(int &)”: 无法将参数 1 从“ll”转换为“int &”