Compilare: user.cpp: In function ‘int main()’: user.cpp:69:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( sum+niv < vv[*c-'a'].size() && vv[*c -'a'][ sum + niv ]<= poz ) ^ user.cpp:73:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( sum == (vv[*c-'a'].size() -1) && vv[*c-'a'][sum] < poz ){ ^ user.cpp:17:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("interesant.in" , "r" , stdin); ^ user.cpp:18:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("interesant.out", "w" , stdout); ^ user.cpp:20:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n",&caz,&n); ^ user.cpp:26:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n",cc); ^ user.cpp:41:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n",cuv[i]); ^