Compilare: user.cpp: In function ‘void bfs()’: user.cpp:39:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < G[w.x].size();i++){ ^ user.cpp:26:8: warning: variable ‘k’ set but not used [-Wunused-but-set-variable] int i,k,j; ^ user.cpp:26:10: warning: unused variable ‘j’ [-Wunused-variable] int i,k,j; ^ user.cpp: In function ‘int main()’: user.cpp:63:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.in","r",stdin); ^ user.cpp:64:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.out","w",stdout); ^ user.cpp:65:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:67:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&cost); ^