Compilare: user.cpp: In function ‘void solve()’: user.cpp:36:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] FORN(i,events.S-1) ^ user.cpp:14:33: note: in definition of macro ‘FORN’ #define FORN(i,n) for(int i=0;i<n;++i) ^ user.cpp:16:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define S size() ^ user.cpp:14:33: note: in definition of macro ‘FORN’ #define FORN(i,n) for(int i=0;i<n;++i) ^ user.cpp:44:18: note: in expansion of macro ‘S’ FORN(q,active.S) ^ user.cpp: In function ‘int main()’: user.cpp:57:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&r); ^ user.cpp:61:69: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d%d",&a[i].start,&a[i].stop,&a[i].exp,&a[i].risc); ^