Compilare: main.cpp: In function 'void search_pattern()': main.cpp:35:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos_t < word.size()) { ~~~~~~^~~~~~~~~~~~~ main.cpp: In function 'void string_match()': main.cpp:116:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (m < phrase.size()) { ~~^~~~~~~~~~~~~~~ main.cpp:124:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == word.size()) { ~~^~~~~~~~~~~~~~ main.cpp:109:9: warning: unused variable 'num_strings' [-Wunused-variable] int num_strings = 0; ^~~~~~~~~~~ main.cpp: In function 'void kmp_table()': main.cpp:163:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (post < word.size()) { ~~~~~^~~~~~~~~~~~~