Compilare: user.cpp: In function ‘short int bfs(int, int)’: user.cpp:53:53: warning: unused variable ‘init’ [-Wunused-variable] int from = 1 , to = 1 , i1 , i2 , x1 , x2 , i , init; ^~~~ user.cpp: In function ‘int main()’: user.cpp:81:42: warning: variable ‘val’ set but not used [-Wunused-but-set-variable] int i , j , a = 0 , b = 0 , c = 0 , val = 0 ; ^~~ user.cpp:105:9: warning: unused variable ‘k1’ [-Wunused-variable] int k1 = 0 , k2 = 0; ^~ user.cpp:105:18: warning: unused variable ‘k2’ [-Wunused-variable] int k1 = 0 , k2 = 0; ^~