Compilare: main.cpp: In function 'll getVal(std::__cxx11::string)': main.cpp:119:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++){ ~~^~~~~~~~~~ main.cpp: In function 'll getMin(std::__cxx11::string, int)': main.cpp:151:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(len < prefix.size() and len < suffix.size()){ ~~~~^~~~~~~~~~~~~~~ main.cpp:151:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(len < prefix.size() and len < suffix.size()){ ~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:206:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i + 1 < s.size(); i++){ ~~~~~~^~~~~~~~~~ main.cpp:209:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++){ ~~^~~~~~~~~~ main.cpp:211:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i; j < s.size(); j++){ ~~^~~~~~~~~~ main.cpp:201:51: 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); ^ main.cpp:202:53: 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); ^