Compilare: user.cpp: In function ‘void formsuperadiacente()’: user.cpp:28:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < ad[i].size(); ++j) ^ user.cpp:30:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < ad[ad[i][j]].size(); ++k) ^ user.cpp: In function ‘void sterge(int, int)’: user.cpp:49:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i<ad[a].size(); ++i) ^ user.cpp: In function ‘bool raspunde(int, int)’: user.cpp:62:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < ad[a].size(); ++i) ^ user.cpp:68:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < supad[a].size(); ++i) ^ user.cpp:74:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < ad[b].size(); ++i) ^ user.cpp:80:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < supad[b].size(); ++i) ^ user.cpp:98:1: warning: control reaches end of non-void function [-Wreturn-type] } ^