Compilare: user.cpp: In function ‘int check_for_solution(int (*)[200], int, int)’: user.cpp:31:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] to_pop==coada.size(); ^ user.cpp:31:11: warning: value computed is not used [-Wunused-value] to_pop==coada.size(); ^ user.cpp:53:28: warning: statement has no effect [-Wunused-value] visited[aux.i+1][aux.j]; ^