Compilare: main.cpp: In function 'int main()': main.cpp:95:9: warning: unused variable 'vmax' [-Wunused-variable] int vmax = (1 << n); ^~~~ main.cpp:96:9: warning: unused variable 'i' [-Wunused-variable] int i = 1; ^ main.cpp:79:33: 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); ^ main.cpp:83:42: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "<%d,%d> ", &x, &y); ^