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:50:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(len<=i && i+len<A.size() && A[i+len]==A[i-len]) ~~~~~^~~~~~~~~ main.cpp:69:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(len<=i && i+len<A.size() && A[i+len]==A[i-len]) ~~~~~^~~~~~~~~ main.cpp:82:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<B.size(); i++) ~^~~~~~~~~ main.cpp:88:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<B.size(); i++) ~^~~~~~~~~ main.cpp:100:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(len<=i && i+len<B.size() && B[i+len]==B[i-len]) ~~~~~^~~~~~~~~ main.cpp:122:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(len<=i && i+len<B.size() && B[i+len]==B[i-len]) ~~~~~^~~~~~~~~