Compilare: main.cpp: In function 'int main()': main.cpp:18:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<S.size(); i++) ~^~~~~~~~~ main.cpp:25:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<S.size(); i++) ~^~~~~~~~~ main.cpp:32:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<=max(A.size(),B.size()); i++) ~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:36:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<A.size(); i++) ~^~~~~~~~~ main.cpp:41:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<A.size(); i++) ~^~~~~~~~~ main.cpp:49:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i+len<A.size() && A[i+len]==A[i-len]) ~~~~~^~~~~~~~~ main.cpp:68:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i+len<A.size() && A[i+len]==A[i-len]) ~~~~~^~~~~~~~~ main.cpp:80:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<B.size(); i++) ~^~~~~~~~~ main.cpp:86:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<B.size(); i++) ~^~~~~~~~~ main.cpp:98:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i+len<B.size() && B[i+len]==B[i-len]) ~~~~~^~~~~~~~~ main.cpp:121:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i+len<B.size() && B[i+len]==B[i-len]) ~~~~~^~~~~~~~~