Compilare: main.cpp: In function 'int main()': main.cpp:12:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<pat.size()) ~^~~~~~~~~~~ main.cpp:20:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<txt.size()) ~^~~~~~~~~~~ main.cpp:24:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==pat.size()) ~^~~~~~~~~~~~ main.cpp:26:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(i<txt.size()&&pat[j]!=txt[i]) ~^~~~~~~~~~~ main.cpp:26:16: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] else if(i<txt.size()&&pat[j]!=txt[i]) ^