Compilare: user.cpp: In function ‘void prefix()’: user.cpp:18:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=2;i<=strlen(a+1);i++) ^ user.cpp: In function ‘void kmp(int)’: user.cpp:29:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<=strlen(a+1);i++) ^ user.cpp: In function ‘int main()’: user.cpp:48:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<=strlen(a1+1);i++) ^ user.cpp:50:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[nrs][++b[nrs][0]]=a1[i]; ^ user.cpp:62:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (nr<v[i].size() && v[i][nr]<ult) ^ user.cpp:64:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (nr<v[i].size()) ^ user.cpp:42:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("potrivire.in","r",stdin); ^ user.cpp:43:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("potrivire.out","w",stdout); ^ user.cpp:45:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:46:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s%s",a+1,a1+1); ^