Compilare: main.cpp: In function 'int main()': main.cpp:38:9: warning: variable 'n' set but not used [-Wunused-but-set-variable] int n,m,k,sol,x,y,rx,ry,i,cst; ^ main.cpp:40:30: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread (buff,1,400000,fin); ^