Compilare: user.cpp: In function ‘int main()’: user.cpp:18:25: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[25]’ [-Wformat=] while(scanf("%s", &s)!=EOF){ ^ user.cpp:14:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] { freopen("text3.in", "r",stdin); ^ user.cpp:15:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("text3.out", "w",stdout); ^ user.cpp:36:26: warning: ‘ii’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(j=v[ii].size()-1; j>=0; j--){ ^