ech.cpp: In function 'int main()': ech.cpp:41: warning: comparison between signed and unsigned integer expressions ech.cpp:58: warning: the address of 'int gata()' will always evaluate as 'true' ech.cpp:38: warning: unused variable 'n' ech.cpp:38: warning: unused variable 'j' ech.cpp: In function 'int gata()': ech.cpp:28: warning: 's1' may be used uninitialized in this function ech.cpp:28: warning: 's2' may be used uninitialized in this function