Compilare: user.cpp: In function ‘int main()’: user.cpp:72:25: warning: variable ‘z’ set but not used [-Wunused-but-set-variable] long long x, y, z; ^ user.cpp:50:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &n, &m, &w); ^ user.cpp:54:42: 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, &z); ^ user.cpp:64:54: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &x, &y, &p[i], &q[i]); ^ user.cpp:73:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lld%lld", &x, &y); ^