Compilare: main.cpp: In function 'int main()': main.cpp:28:17: warning: unused variable 'left' [-Wunused-variable] int n,k,i,j,left,dr,nr,elem,s,lin; ^~~~ main.cpp:28:22: warning: unused variable 'dr' [-Wunused-variable] int n,k,i,j,left,dr,nr,elem,s,lin; ^~ main.cpp:28:25: warning: unused variable 'nr' [-Wunused-variable] int n,k,i,j,left,dr,nr,elem,s,lin; ^~ main.cpp:28:28: warning: unused variable 'elem' [-Wunused-variable] int n,k,i,j,left,dr,nr,elem,s,lin; ^~~~ main.cpp:29:23: warning: unused variable 'maxi' [-Wunused-variable] long long sol,sum,maxi; ^~~~ main.cpp:30:31: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,10000000,fin); ^ main.cpp:44:27: warning: 'sum' may be used uninitialized in this function [-Wmaybe-uninitialized] while (j-1 && sum + v[j-1] <= s){ ~~~~^~~~~~~~