Compilare: main.cpp: In function 'bool cup(short unsigned int)': main.cpp:23:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (rgh[nd].size() == k){ ~~~~~~~~~~~~~~~^~~~ main.cpp:21:8: warning: unused variable 'nd' [-Wunused-variable] ui nd; ^~ main.cpp: In function 'int main()': main.cpp:43:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("negot.in","r",stdin); ^ main.cpp:44:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("negot.out","w",stdout); ^ main.cpp:45:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&n,&m,&k); ^ main.cpp:47:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&nr); ^ main.cpp:49:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^