0_0_26775399_11994.c:5:1: error: unknown type name 'bool'
bool sushu(int a)
^
0_0_26775399_11994.c:15:1: error: unknown type name 'bool'
bool huiwen(int a)
^
0_0_26775399_11994.c: In function 'main':
0_0_26775399_11994.c:46:13: error: expected expression before '/' token
// if(i<=505000)
^
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