Compilare: main.cpp: In function 'int main()': main.cpp:90:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (wildcard[i].size () < mx) ~~~~~~~~~~~~~~~~~~~~^~~~ main.cpp:71:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("wildcards.in", "r", stdin); ^ main.cpp:72:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("wildcards.out", "w", stdout); ^