/in/foo.cc: In function 'void DFS(int, int, int)':
/in/foo.cc:33:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   for(i=1;i<=n;i++)
   ^~~
/in/foo.cc:37:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
    DFS(k+1,i,len-a[i]);
    ^~~
/in/foo.cc: In function 'void solve()':
/in/foo.cc:56:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j;
        ^