Compilare: main.cpp: In function 'int main()': main.cpp:10:9: warning: unused variable 'i' [-Wunused-variable] int i,j; ^ main.cpp:10:11: warning: unused variable 'j' [-Wunused-variable] int i,j; ^ main.cpp:11:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&l); ^