0_0_31957522_8304.cpp: In function 'int cg(int)':
0_0_31957522_8304.cpp:15:57: error: 'inv' was not declared in this scope
return (1ll*n*(n+1)%M*(2*n+1)%M*inv6%M-3ll*n%M*(n+1)%M*inv
^
0_0_31957522_8304.cpp:15:57: error: expected ')' at end of input
0_0_31957522_8304.cpp:15:57: error: expected ';' at end of input
0_0_31957522_8304.cpp:15:57: error: expected '}' at end of input
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