Compilare: main.cpp: In function 'int main()': main.cpp:58:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (ll dim=0; dim<s.size(); dim++) ~~~^~~~~~~~~ main.cpp:64:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (ll j=0; j+dim+1<s.size(); j++) ~~~~~~~^~~~~~~~~ main.cpp:52:11: warning: unused variable 'h' [-Wunused-variable] ll t, h; ^ main.cpp:42:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("strdup.in", "r", stdin); ^ main.cpp:43:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("strdup.out", "w", stdout); ^