Compilare: main.cpp: In function 'int check(int, int)': main.cpp:8:13: warning: variable 'elem' set but not used [-Wunused-but-set-variable] int i , elem , j , sol = 0; ^~~~ main.cpp:8:24: warning: unused variable 'sol' [-Wunused-variable] int i , elem , j , sol = 0; ^~~ main.cpp: In function 'int main()': main.cpp:28:26: warning: unused variable 'elem' [-Wunused-variable] int i , conf , bit , elem , j , val , sol , st , dr; ^~~~ main.cpp:29:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&k); ^ main.cpp:31:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&v[i]); ^