Compilare: user.cpp: In function ‘int main()’: user.cpp:89:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( input_file, "%d %d", &N, &M ); ^ user.cpp:92:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( input_file, "%d", &type ); ^ user.cpp:96:94: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] Q ++; fscanf( input_file, "%d %d %d", &Skunk[Q].c, &Skunk[Q].m, &Skunk[Q].p ); ^ user.cpp:138:56: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( input_file, "%d %d", &st, &dr ); ^ user.cpp:131:66: warning: ‘pos2’ may be used uninitialized in this function [-Wmaybe-uninitialized] my_tree.update_tree( 1, 1, N, pos1, pos2, Q ); ^ user.cpp:131:66: warning: ‘pos1’ may be used uninitialized in this function [-Wmaybe-uninitialized]