Compilare: main.cpp: In function 'long long int calc()': main.cpp:83:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 83 | for(i=0; i<vec.size(); i++) | ~^~~~~~~~~~~ main.cpp:106:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 106 | for(i=0; i<vec.size(); i++) | ~^~~~~~~~~~~ main.cpp:77:11: warning: unused variable 'j' [-Wunused-variable] 77 | int i,j,curr; | ^ main.cpp: In function 'int main()': main.cpp:126:13: warning: unused variable 'j' [-Wunused-variable] 126 | int n,i,j,k,l,curr; | ^ main.cpp:126:15: warning: unused variable 'k' [-Wunused-variable] 126 | int n,i,j,k,l,curr; | ^ main.cpp:126:17: warning: unused variable 'l' [-Wunused-variable] 126 | int n,i,j,k,l,curr; | ^