Compilare: main.cpp: In function 'int main()': main.cpp:92:11: warning: unused variable '_' [-Wunused-variable] int _ = update (); ^ main.cpp:80:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d", &n, &m); ^ main.cpp:82:41: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d%d", &x, &y, &cap); ^