Compilare: main.cpp:3: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas] 3 | #pragma GCC optimization("Ofast") | main.cpp: In function 'int main()': main.cpp:98:15: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 98 | for(i=0; i<vec.size(); i++) | ~^~~~~~~~~~~ main.cpp:79:15: warning: unused variable 'b' [-Wunused-variable] 79 | long long b,c,n,x,y,i; | ^ main.cpp:79:17: warning: unused variable 'c' [-Wunused-variable] 79 | long long b,c,n,x,y,i; | ^