Compilare: main.cpp: In function 'void Solve_1()': main.cpp:67:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < V.size(); ++i) ~~^~~~~~~~~~ main.cpp:68:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i+1; j < V.size(); ++j) ~~^~~~~~~~~~ main.cpp:72:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < O.size(); ++k) ~~^~~~~~~~~~ main.cpp: In function 'void Solve_2()': main.cpp:98:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < O.size(); ++i) ~~^~~~~~~~~~ main.cpp:99:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i+1; j < O.size(); ++j) ~~^~~~~~~~~~ main.cpp:103:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < V.size(); ++k) ~~^~~~~~~~~~