Compilare: main.cpp: In function 'long long int solve1(long long int)': main.cpp:60:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'long long int solve2(long long int)': main.cpp:106:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: At global scope: main.cpp:108:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^