Compilare: main.cpp: In function 'void solve()': main.cpp:56:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++) ~~^~~~~~~~~~ main.cpp:64:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < s.size(); i++) ~~^~~~~~~~~~ main.cpp:75:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s1.l + s2.l <= s.size()){ ~~~~~~~~~~~~^~~~~~~~~~~