Compilare: main.cpp: In function 'void Compute_Prefix()': main.cpp:49:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i <= s.size(); i++){ ~~^~~~~~~~~~~ main.cpp: In function 'void KMP(int, bool&)': main.cpp:71:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j == s.size() - 1){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:85:40: 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:86:42: 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); ^