Compilare: user.cpp: In function ‘int main()’: user.cpp:27:9: warning: unused variable ‘x’ [-Wunused-variable] int x,sol=0,poz; ^ user.cpp:25:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("move.in","r",stdin); ^ user.cpp:26:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("move.out","w",stdout); ^ user.cpp:28:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:31:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^ user.cpp:38:37: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(poz!=0) {vaz[v[poz]]=1;poz=tata[poz];} ~~~^~~~~~~~~~