Compilare: user.cpp: In function ‘void df(long int)’: user.cpp:14:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<a[x].size();++i) { ^ user.cpp: In function ‘int main()’: user.cpp:26:18: warning: format ‘%d’ expects argument of type ‘int*’, but argument 2 has type ‘long int*’ [-Wformat=] scanf("%d",&t); ^ user.cpp:28:31: warning: format ‘%d’ expects argument of type ‘int*’, but argument 2 has type ‘long int*’ [-Wformat=] scanf("%d%d",&n,&m); ^ user.cpp:28:31: warning: format ‘%d’ expects argument of type ‘int*’, but argument 3 has type ‘long int*’ [-Wformat=] user.cpp:30:33: warning: format ‘%d’ expects argument of type ‘int*’, but argument 2 has type ‘long int*’ [-Wformat=] scanf("%d",&v[i]); ^ user.cpp:34:35: warning: format ‘%d’ expects argument of type ‘int*’, but argument 2 has type ‘long int*’ [-Wformat=] scanf("%d%d",&x,&y); ^ user.cpp:34:35: warning: format ‘%d’ expects argument of type ‘int*’, but argument 3 has type ‘long int*’ [-Wformat=] user.cpp:46:32: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long int’ [-Wformat=] printf("%d\n",maxim); ^ user.cpp:24:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("easygraph.in","r",stdin); ^ user.cpp:25:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("easygraph.out","w",stdout); ^ user.cpp:26:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp:28:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:30:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^ user.cpp:34:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^