Compilare: user.cpp: In function ‘void read()’: user.cpp:10:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "traseu3.in", "r", stdin ); ^ user.cpp:11:71: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d%d%d%d%d%d%d", &n, &m, &k1, &l1, &c1, &k2, &l2, &c2 ); ^ user.cpp:13:56: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d%d", &x, &y, &z ), v[x][y][z] = -1; ^ user.cpp: In function ‘int main()’: user.cpp:61:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "traseu3.out", "w", stdout ); ^