Compilare: main.cpp: In function 'int solve()': main.cpp:63:9: warning: unused variable 'i' [-Wunused-variable] int i,j,l=dr1-st1+1+dr2-st2+1,sol=0; ^ main.cpp:63:11: warning: unused variable 'j' [-Wunused-variable] int i,j,l=dr1-st1+1+dr2-st2+1,sol=0; ^ main.cpp: In function 'void solvetest()': main.cpp:81:19: warning: unused variable 'r' [-Wunused-variable] int n,m,q,i,j,r; ^ main.cpp: In member function 'void instream::advance()': main.cpp:37:48: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer,SIZE,1,input_file); ^ main.cpp: In constructor 'instream::instream(const char*)': main.cpp:11:44: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer,SIZE,1,input_file); ^