Compilare: user.cpp: In function ‘int main()’: user.cpp:65:27: 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:69:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&nr); ^ user.cpp:73:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&val); ^ user.cpp:80:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&c,&a,&b); ^ user.cpp: In function ‘int c2(int, int)’: user.cpp:47:12: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] return last; ^