Compilare: main.cpp: In function 'int main()': main.cpp:42:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ( j < im[0].size() && intersect (im[0][j], mu[i]) == 0 ) j++; ~~^~~~~~~~~~~~~~ main.cpp:44:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( j == im[0].size() ) im[0].push_back ( mu[i] ); ~~^~~~~~~~~~~~~~~ main.cpp:48:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < im[0].size(); i++ ) fout << im[0][i].fi << ' ' << im[0][i].se << ' ' << 1 << '\n'; ~~^~~~~~~~~~~~~~ main.cpp:49:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < im[1].size(); i++ ) fout << im[1][i].fi << ' ' << im[1][i].se << ' ' << 2 << '\n'; ~~^~~~~~~~~~~~~~ main.cpp:30:13: warning: unused variable 'a' [-Wunused-variable] int i, j, a, b; ^ main.cpp:30:16: warning: unused variable 'b' [-Wunused-variable] int i, j, a, b; ^