Compilare: main.cpp: In function 'int Solver::solve(int, int, std::vector<std::vector<int> >)': main.cpp:134:14: warning: variable 'dif2' set but not used [-Wunused-but-set-variable] 134 | auto dif2=[&](int x,int y) | ^~~~ main.cpp: At global scope: main.cpp:191:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] 191 | main() { | ^~~~