Compilare: main.cpp: In function 'int main()': main.cpp:63:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < sol1.size(); i++) ~~^~~~~~~~~~~~~ main.cpp:65:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = sol1.size(); i < sol2.size(); i++) ~~^~~~~~~~~~~~~ main.cpp:68:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < sol2.size(); i++) ~~^~~~~~~~~~~~~ main.cpp:70:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = sol2.size(); i < sol1.size(); i++) ~~^~~~~~~~~~~~~ main.cpp:78:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < sol.size(); i++) ~~^~~~~~~~~~~~