Compilare: user.cpp: In function ‘int bfs()’: user.cpp:29:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[i].size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:79:23: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long long int’ [-Wformat=] printf("%d\n",cost); ^ user.cpp:60:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,ok=1; ^ user.cpp:60:13: warning: unused variable ‘ok’ [-Wunused-variable] int i,j,ok=1; ^ user.cpp:58:33: 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:59:35: 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:62:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d",&n,&m,&source,&dest); ^ user.cpp:65:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d",&x,&y,&z,&k); ^