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View Compilation Error

0_0_22961267_3329.cpp: In function 'void Perm(int*, int, int)':
0_0_22961267_3329.cpp:28:25: error: 'Output' was not declared in this scope
              Output(a, n) ;
                         ^
0_0_22961267_3329.cpp:34:28: error: 'swap' was not declared in this scope
             swap(a[k], a[t]) ;
                            ^


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