Compilare: main.cpp: In function 'void Lps()': main.cpp:21:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 1; i < pat.size(); ++i ) ~~^~~~~~~~~~~~ main.cpp: In function 'void Do()': main.cpp:39:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( i < A.size() ) { ~~^~~~~~~~~~ main.cpp:45:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( j == pat.size() ) { ~~^~~~~~~~~~~~~ main.cpp:51:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( i < A.size() && pat[j] != A[i] ) ~~^~~~~~~~~~ main.cpp:51:12: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if( i < A.size() && pat[j] != A[i] ) ^ main.cpp:58:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < pos.size(); ++i ) ~~^~~~~~~~~~~~