Compilare: main.cpp: In function 'void generLPS()': main.cpp:13:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int len = 0, i = 1; i < pat.length();) ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:29:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0, j = 0; i < txt.length();) { ~~^~~~~~~~~~~~~~ main.cpp:35:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j == pat.length()) ans.push_back(i - j); ~~^~~~~~~~~~~~~~~ main.cpp:25:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in", "r", stdin); ^ main.cpp:26:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out", "w", stdout); ^