Compilare: user.cpp: In function ‘void sorting()’: user.cpp:122:6: warning: unused variable ‘st’ [-Wunused-variable] int st=0, dr=-1; ^ user.cpp:122:12: warning: unused variable ‘dr’ [-Wunused-variable] int st=0, dr=-1; ^ user.cpp: In function ‘int main()’: user.cpp:179:9: warning: variable ‘nd1’ set but not used [-Wunused-but-set-variable] Need nd1; ^ user.cpp:165:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &t); ^ user.cpp:168:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &n, &m); ^ user.cpp:173:52: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %d", &M[i].x, &M[i].y, &M[i].cost); ^