Compilare: user.cpp: In function ‘int main()’: user.cpp:19:54: warning: operation on ‘st’ may be undefined [-Wsequence-point] else if( x == 2 ) printf("%d %d\n",st++,st++); ^ user.cpp:20:49: warning: operation on ‘dr’ may be undefined [-Wsequence-point] else printf("%d %d %d\n",dr--,dr--,dr--); ^ user.cpp:20:49: warning: operation on ‘dr’ may be undefined [-Wsequence-point] user.cpp:10:18: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, st, dr, x, y; ^ user.cpp:10:32: warning: unused variable ‘y’ [-Wunused-variable] int n, m, i, j, st, dr, x, y; ^ user.cpp:7:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trenul.in","r",stdin); ^ user.cpp:8:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trenul.out","w",stdout); ^ user.cpp:12:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:17:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^