Compilare: main.cpp: In function 'int main()': main.cpp:184:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 184 | for(int i = 1 ; i < sol.size () - 1 ; ++ i) | ~~^~~~~~~~~~~~~~~~~ main.cpp:189:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 189 | for(int i = 0 ; i < sol.size () - 1 ; ++ i) | ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void solve2()': main.cpp:110:27: warning: 'ind' may be used uninitialized in this function [-Wmaybe-uninitialized] 110 | val [perm [ind]] = x; | ~~~~~~~~~^ main.cpp:64:35: warning: 'idk' may be used uninitialized in this function [-Wmaybe-uninitialized] 64 | val [perm [idk]] = 3; | ~~~~~~~~~^ main.cpp:62:30: warning: 'ik' may be used uninitialized in this function [-Wmaybe-uninitialized] 62 | val [perm [ik]] = x; | ~~~~~~~~^