Compilare: user.cpp: In function ‘bool bellmanford(int)’: user.cpp:57:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vecin[nod].size();i++){ ^ user.cpp: In function ‘bool dijkstra()’: user.cpp:103:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vecin[nod].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:168:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<vecin[i].size();j++){ ^ user.cpp:148:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("fmcm.in","r",stdin); ^ user.cpp:149:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("fmcm.out","w",stdout); ^ user.cpp:152:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d%d",&n,&m,&S,&D); ^ user.cpp:155:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d%d",&x,&y,&w,&z); ^