Compilare: main.cpp: In function 'void read()': main.cpp:18:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d %d %d",&n,&p,&q,&m); ^ main.cpp:22:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d",&s,&t); ^ main.cpp: In function 'void solve()': main.cpp:29:7: warning: 'year' may be used uninitialized in this function [-Wmaybe-uninitialized] int year; ^~~~