Compilare: main.cpp: In function 'int match(int)': main.cpp:35:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (cur == pattern.size () - 1) { ~~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("potrivire.in", "r", stdin); ^ main.cpp:48:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("potrivire.out", "w", stdout); ^