Compilare: user.cpp: In function ‘int main()’: user.cpp:76:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, x, y; ^ user.cpp:90:9: warning: unused variable ‘t’ [-Wunused-variable] int t = 0; ^ user.cpp:78:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &k); ^ user.cpp:80:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &x, &y); ^