Compilare: user.cpp:9:22: warning: integer overflow in expression [-Woverflow] const int oo=(1<<31)-1; ^ user.cpp: In function ‘void Citire()’: user.cpp:31:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d%d%d", &n, &m, &xi, &xf); ^ user.cpp:34:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d%d", &x, &y, &D); ^