Compilare: In function 'long long int exp(long long int, long long int)', inlined from 'int main()' at main.cpp:47:59: main.cpp:20:16: warning: 'fact3' may be used uninitialized [-Wmaybe-uninitialized] 20 | a = (a * a) % MOD; | ~~~^~~~ main.cpp: In function 'int main()': main.cpp:36:33: note: 'fact3' was declared here 36 | long long fact1, fact2, fact3, fact = 1; | ^~~~~ In function 'long long int exp(long long int, long long int)', inlined from 'int main()' at main.cpp:47:30: main.cpp:19:24: warning: 'fact2' may be used uninitialized [-Wmaybe-uninitialized] 19 | res = (res * a) % MOD; | ~~~~~^~~~ main.cpp: In function 'int main()': main.cpp:36:26: note: 'fact2' was declared here 36 | long long fact1, fact2, fact3, fact = 1; | ^~~~~ main.cpp:47:25: warning: 'fact1' may be used uninitialized [-Wmaybe-uninitialized] 47 | fout << ((fact1 * exp(fact2, MOD - 2)) % MOD * exp(fact3, MOD - 2)) % MOD; | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:36:19: note: 'fact1' was declared here 36 | long long fact1, fact2, fact3, fact = 1; | ^~~~~