Compilare: user.cpp: In function ‘bool ok(int)’: user.cpp:7:9: warning: unused variable ‘i’ [-Wunused-variable] int i=0,t=1,vol; ^ user.cpp: In function ‘int main()’: user.cpp:29:12: warning: statement has no effect [-Wunused-value] for(pas; pas>0; pas=pas>>1) ^ user.cpp:24:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("transport.in","r",stdin); ^ user.cpp:25:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("transport.out","w",stdout); ^ user.cpp:26:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&k); ^ user.cpp:27:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=0; i<n; i++) scanf("%d",&v[i]); ^