Compilare: user.cpp: In function ‘void dijkstra_test1()’: user.cpp:45:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0 ; i < g[node].size() ; i++ ) ^ user.cpp: In function ‘void read()’: user.cpp:20:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "dragoni.in" , "r" , stdin ) ; ^ user.cpp:21:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d" , &test ) ; ^ user.cpp:22:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d %d" , &n , &m ) ; ^ user.cpp:24:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d" , &Species[i] ) ; ^ user.cpp: In function ‘int main()’: user.cpp:103:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d %d %d" , &x , &y , &z ) ; ^ user.cpp:123:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d %d %d" , &x , &y , &z ) ; ^