Compilare: user.cpp: In function ‘void Read()’: user.cpp:41:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cartite.in","r",stdin); ^ user.cpp:43:54: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n%d %d\n%d %d\n", &p, &N, &M, &xs, &ys); ^ user.cpp:47:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &K); ^ user.cpp:50:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d\n", &x, &y, &r); ^ user.cpp:57:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &G); ^ user.cpp:60:67: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d\n", &V[i].a, &V[i].b, &V[i].c, &V[i].d); ^ user.cpp: In function ‘void Solve()’: user.cpp:88:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cartite.out","w",stdout); ^ user.cpp:132:30: warning: ‘yr’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout << xr << ' ' << yr << ' ' << answer - 1 << '\n'; ^ user.cpp:132:17: warning: ‘xr’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout << xr << ' ' << yr << ' ' << answer - 1 << '\n'; ^