foo.c: In function 'FindSecondMax':
foo.c:21:37: warning: unused variable 'imax1' [-Wunused-variable]
   21 |         int i,j;int max1, max2; int imax1, imax2;
      |                                     ^~~~~
foo.c: In function 'main':
foo.c:51:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   51 |     for(int i=0;i<n2;i++)
      |     ^~~
foo.c:53:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   53 |         int amax=FindSecondMax(a,n1);
      |         ^~~
foo.c: In function 'FindSecondMax':
foo.c:21:44: warning: 'imax2' may be used uninitialized [-Wmaybe-uninitialized]
   21 |         int i,j;int max1, max2; int imax1, imax2;
      |                                            ^~~~~

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