Compilare: user.cpp: In function ‘void dijkstra(int)’: user.cpp:58:15: warning: unused variable ‘pos’ [-Wunused-variable] int u, v, pos, cost, w; ^ user.cpp: In function ‘void read()’: user.cpp:109:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &N, &M, &K); ^ user.cpp:111:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &take[i]); ^ user.cpp:115:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &u, &v, &cost); ^