Compilare: main.cpp: In function 'int main()': main.cpp:27:25: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&n); ^ main.cpp:19:30: warning: 'cmmdc' may be used uninitialized in this function [-Wmaybe-uninitialized] return ((long long)p10[nr-1]*9)%MOD; ~~^~ main.cpp:26:22: note: 'cmmdc' was declared here int n,i,d,n2,sol,cmmdc,biti,div=0; ^~~~~