Compilare: user.cpp: In function ‘int main()’: user.cpp:12:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d",&n,&k,&m); ^ user.cpp:16:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&x,&y); ^ user.cpp:32:9: warning: ‘cop’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(cop==a) ^ user.cpp:37:14: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized] n=w[a]; ^