Compilare: main.cpp: In function 'int main()': main.cpp:34:11: warning: statement has no effect [-Wunused-value] for(dr;dr;dr>>=1){ ^ main.cpp:25:10: warning: unused variable 'ok' [-Wunused-variable] bool ok=1; ^~ main.cpp:27:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sirag.in","r",stdin); ^ main.cpp:28:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sirag.out","w",stdout); ^ main.cpp:30:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&k,&p); ^ main.cpp:32:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld",&v[i]) , dr+=v[i]; ^