Compilare: user.cpp: In function ‘void Read()’: user.cpp:83:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &N, &L); ^ user.cpp:84:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &W[1]); ^ user.cpp:85:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %d %d", &A, &B, &C1, &D); ^ user.cpp: In function ‘int main()’: user.cpp:143:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("center.in", "r", stdin); ^ user.cpp:144:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("center.out", "w", stdout); ^ user.cpp: In function ‘double cost(double)’: user.cpp:76:24: warning: ‘ras’ may be used uninitialized in this function [-Wmaybe-uninitialized] return a[st[ras]].get_val (x); ^ user.cpp:67:24: note: ‘ras’ was declared here int p, u, mij, ras; ^ user.cpp:76:24: warning: ‘ras’ may be used uninitialized in this function [-Wmaybe-uninitialized] return a[st[ras]].get_val (x); ^ user.cpp:67:24: note: ‘ras’ was declared here int p, u, mij, ras; ^