Compilare: user.cpp: In function ‘long long int getNr(std::string)’: user.cpp:13:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a.size(); ++i) ^ user.cpp: In function ‘long long int match(std::string, std::string)’: user.cpp:36:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a.size(); ++i) ^ user.cpp: In function ‘std::string substr(std::string, int, int)’: user.cpp:55:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i>=0 && i<s.size()) ^ user.cpp: In function ‘int checkSucc(std::string, int, int, long long int)’: user.cpp:89:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(spoz<s.size()) ^ user.cpp: In function ‘int main()’: user.cpp:136:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int nsize = 1; nsize <= s.size(); ++nsize) ^ user.cpp:138:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int spoz = 0; spoz < s.size(); ++spoz) ^ user.cpp:140:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(spoz+nsize-1 >= s.size() && spoz - nsize >=0) ^ user.cpp:143:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(spoz+nsize-1 < s.size() && s[spoz]!='0') ^ user.cpp:127:54: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("infinitepatternmatching.in", "r", stdin); ^ user.cpp:128:56: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("infinitepatternmatching.out", "w", stdout); ^