Compilare: main.cpp: In function 'bool caut(unsigned int)': main.cpp:22:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[cod].size();++i) if(v[cod][i]==x) return 1; ~^~~~~~~~~~~~~~ main.cpp: In function 'void baga(unsigned int)': main.cpp:28:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[cod].size();++i) if(v[cod][i]==x) return; ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:33:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("abc2.in","r",stdin); ^ main.cpp:34:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("abc2.out","w",stdout); ^ main.cpp:35:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s",s); ^