Compilare: main.cpp: In function 'void biconex(int, int)': main.cpp:15:9: warning: variable 'x' set but not used [-Wunused-but-set-variable] int x, y; ^ main.cpp: In function 'int main()': main.cpp:56:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ans.size(); ++i){ ~~^~~~~~~~~~~~ main.cpp:57:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < ans[i].size(); ++j){ ~~^~~~~~~~~~~~~~~