Compilare: main.cpp: In function 'int main()': main.cpp:40:21: warning: unused variable 's' [-Wunused-variable] int t,c,i,l,n,k,s,d,vf,max1,j; ^ main.cpp:40:23: warning: unused variable 'd' [-Wunused-variable] int t,c,i,l,n,k,s,d,vf,max1,j; ^ main.cpp:40:25: warning: unused variable 'vf' [-Wunused-variable] int t,c,i,l,n,k,s,d,vf,max1,j; ^~ main.cpp: In function 'char next_ch()': main.cpp:13:32: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,dim,stdin); ^ main.cpp: In function 'int main()': main.cpp:38:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sec.in","r",stdin); ^ main.cpp:39:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sec.out","w",stdout); ^