Compilare: user.cpp: In function ‘int main()’: user.cpp:91:34: warning: statement has no effect [-Wunused-value] e-i; ^ user.cpp:13:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&m); ^ user.cpp:16:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d ",&a[i]); ^ user.cpp:20:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d ",&b[i]); ^ user.cpp:64:8: warning: ‘e’ may be used uninitialized in this function [-Wmaybe-uninitialized] r=e-c+1; ^ user.cpp:49:8: warning: ‘q’ may be used uninitialized in this function [-Wmaybe-uninitialized] w=q-c+1; ^