Compilare: user.cpp: In function ‘void dijkstra()’: user.cpp:50:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[nod.x].size (); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:67:42: 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:68:44: 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); ^ user.cpp:72:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &n, &m); ^ user.cpp:76:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d", &x, &y, &w); ^