Compilare: user.cpp: In function ‘int main()’: user.cpp:10:27: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘std::string* {aka std::basic_string<char>*}’ [-Wformat=] scanf("%s\n",&s[i]),sort(s[i].begin(),s[i].end()); ^ user.cpp:8:89: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("restante.in","r",stdin),freopen("restante.out","w",stdout),scanf("%d\n",&n); ^ user.cpp:8:89: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:8:89: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:10:58: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n",&s[i]),sort(s[i].begin(),s[i].end()); ^