Compilare: main.cpp: In function 'int main()': main.cpp:50:9: warning: unused variable 'ans' [-Wunused-variable] int ans = 0; ^~~ main.cpp: In function 'int i32()': main.cpp:29:32: 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,LEN,f); ^ main.cpp:37:32: 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,LEN,f); ^ main.cpp: In function 'int main()': main.cpp:48:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&k); ^ main.cpp:53:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lld",&a[i]); ^ main.cpp:58:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lld",&b[i]); ^