Compilare: user.cpp: In function ‘bool palin(int, int)’: user.cpp:27:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define SZ(x) x.size() ^ user.cpp:22:38: note: in definition of macro ‘FOR’ #define FOR(i,n) for (int i = 0 ; i< n;i++) ^ user.cpp:58:11: note: in expansion of macro ‘SZ’ FOR(x,SZ(adj[i])) ^ user.cpp:27:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define SZ(x) x.size() ^ user.cpp:22:38: note: in definition of macro ‘FOR’ #define FOR(i,n) for (int i = 0 ; i< n;i++) ^ user.cpp:67:11: note: in expansion of macro ‘SZ’ FOR(x,SZ(adj[i])) ^ user.cpp:27:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define SZ(x) x.size() ^ user.cpp:22:38: note: in definition of macro ‘FOR’ #define FOR(i,n) for (int i = 0 ; i< n;i++) ^ user.cpp:68:11: note: in expansion of macro ‘SZ’ FOR(y,SZ(adj[j])) ^ user.cpp: In function ‘int main()’: user.cpp:90:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:94:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d\n",&x,&y); ^ user.cpp:101:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%c ",&ch[i]); ^