Compilare: user.cpp: In function ‘int main()’: user.cpp:174:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d\n",&N,&M); ^ user.cpp:177:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%c",&C); ^ user.cpp:178:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] if(C=='I'){fscanf(f,"%d %d\n",&x,&y);ins(T,x,y,rand());} ^ user.cpp:179:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] else if(C=='A'){fscanf(f,"%d\n",&x);fprintf(g,"%d\n",fi(T,x));} ^