Compilare: user.cpp: In function ‘void dijkstra(int)’: user.cpp:65:9: warning: unused variable ‘i’ [-Wunused-variable] int i, x, y, cost, p, Min; ^ user.cpp: In function ‘void read()’: user.cpp:47:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &N, &M); ^ user.cpp:51:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &y, &cost); ^ user.cpp: In function ‘int main()’: user.cpp:106:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("transport2.in", "r", stdin); ^ user.cpp:107:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("transport2.out", "w", stdout); ^