Compilare: user.cpp: In function ‘int check(int)’: user.cpp:32:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(nst < v1.size() && st < l.size() && (l[st] < v1[nst])) ++st; ^ user.cpp:32:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(nst < v1.size() && st < l.size() && (l[st] < v1[nst])) ++st; ^ user.cpp:34:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(st < l.size() && is[l[st]] != num){ ^ user.cpp:51:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();++i){ ^ user.cpp: In function ‘int main()’: user.cpp:62:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("seriale.in","r",stdin); ^ user.cpp:63:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("seriale.out","w",stdout); ^ user.cpp:64:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&N,&K); ^ user.cpp:68:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^ user.cpp:93:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^