/in/foo.cc: In function 'int FMP(int*, int)':
/in/foo.cc:16:12: warning: 's' may be used uninitialized [-Wmaybe-uninitialized]
   16 |     return s;
      |            ^
/in/foo.cc:7:9: note: 's' was declared here
    7 |     int s;
      |         ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:34:43: warning: 's' may be used uninitialized [-Wmaybe-uninitialized]
   34 |     cout << FMP(a, n1) << ' ' << FMP(b, n2);
      |                                           ^
/in/foo.cc:7:9: note: 's' was declared here
    7 |     int s;
      |         ^
/in/foo.cc:34:27: warning: 's' may be used uninitialized [-Wmaybe-uninitialized]
   34 |     cout << FMP(a, n1) << ' ' << FMP(b, n2);
      |                           ^~~
/in/foo.cc:7:9: note: 's' was declared here
    7 |     int s;
      |         ^