Compilare: main.cpp: In function 'int main()': main.cpp:36:9: warning: unused variable 'cnt' [-Wunused-variable] int cnt = 0; ^~~ main.cpp:28:23: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&n); ^ main.cpp:32:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&a[i].val); ^