Compilare: user.cpp: In function ‘int main()’: user.cpp:10:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "teatru.in", "r", stdin ); ^ user.cpp:11:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "teatru.out", "w", stdout ); ^ user.cpp:16:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d\n", &n, &m ); ^ user.cpp:20:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%c", &c ); ^ user.cpp:47:5: warning: ‘dr’ may be used uninitialized in this function [-Wmaybe-uninitialized] for( ;st<=dr;st++ ) ^ user.cpp:47:5: warning: ‘st’ may be used uninitialized in this function [-Wmaybe-uninitialized]