/in/foo.c: In function 'main':
/in/foo.c:7:2: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
  scanf("%d%d",&M,&N);
  ^~~~~
/in/foo.c:7:2: warning: incompatible implicit declaration of built-in function 'scanf'
/in/foo.c:7:2: note: include '<stdio.h>' or provide a declaration of 'scanf'
/in/foo.c:19:14: warning: passing argument 1 of 'findmin' from incompatible pointer type [-Wincompatible-pointer-types]
    x=findmin(a,a[i][j],i,j,M);
              ^
/in/foo.c:1:5: note: expected 'int (*)[10]' but argument is of type 'int (*)[500]'
 int findmin(int a[][10],int x,int i,int j,int M);
     ^~~~~~~
/in/foo.c:20:14: warning: passing argument 1 of 'findmax' from incompatible pointer type [-Wincompatible-pointer-types]
    y=findmax(a,a[i][j],i,j,N);
              ^
/in/foo.c:2:5: note: expected 'int (*)[10]' but argument is of type 'int (*)[500]'
 int findmax(int a[][10],int x,int i,int j,int N);
     ^~~~~~~
/in/foo.c:25:2: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
  printf("%d",flag);
  ^~~~~~
/in/foo.c:25:2: warning: incompatible implicit declaration of built-in function 'printf'
/in/foo.c:25:2: note: include '<stdio.h>' or provide a declaration of 'printf'
/in/foo.c: At top level:
/in/foo.c:29:5: error: conflicting types for 'findmin'
 int findmin(int a[][500],int x,int i,int j,int M)
     ^~~~~~~
/in/foo.c:1:5: note: previous declaration of 'findmin' was here
 int findmin(int a[][10],int x,int i,int j,int M);
     ^~~~~~~
/in/foo.c: In function 'findmin':
/in/foo.c:32:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(int k=0;k<M;k++)
  ^~~
/in/foo.c:39:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   return n;
   ^~~~~~
/in/foo.c: At top level:
/in/foo.c:41:5: error: conflicting types for 'findmax'
 int findmax(int a[][500],int x,int i,int j,int N)
     ^~~~~~~
/in/foo.c:2:5: note: previous declaration of 'findmax' was here
 int findmax(int a[][10],int x,int i,int j,int N);
     ^~~~~~~
/in/foo.c: In function 'findmax':
/in/foo.c:44:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(int k=0;k<N;k++)
  ^~~
/in/foo.c:51:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   return n;
   ^~~~~~