Compilare: user.cpp: In function ‘void DFS(int, int, int)’: user.cpp:19:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define sz size() ^ user.cpp:43:51: note: in expansion of macro ‘sz’ if (xx < 1 || yy < 1 || zz < 1 || xx >= X.sz || yy >= Y.sz || zz >= Z.sz || U[xx][yy][zz]) ^ user.cpp:19:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define sz size() ^ user.cpp:43:65: note: in expansion of macro ‘sz’ if (xx < 1 || yy < 1 || zz < 1 || xx >= X.sz || yy >= Y.sz || zz >= Z.sz || U[xx][yy][zz]) ^ user.cpp:19:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define sz size() ^ user.cpp:43:79: note: in expansion of macro ‘sz’ if (xx < 1 || yy < 1 || zz < 1 || xx >= X.sz || yy >= Y.sz || zz >= Z.sz || U[xx][yy][zz]) ^ user.cpp: In function ‘double solve()’: user.cpp:19:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define sz size() ^ user.cpp:89:23: note: in expansion of macro ‘sz’ for (x = 1; x < X.sz; x++) ^ user.cpp:19:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define sz size() ^ user.cpp:90:27: note: in expansion of macro ‘sz’ for (y = 1; y < Y.sz; y++) ^ user.cpp:19:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define sz size() ^ user.cpp:91:31: note: in expansion of macro ‘sz’ for (z = 1; z < Z.sz; z++) ^ user.cpp:19:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define sz size() ^ user.cpp:94:23: note: in expansion of macro ‘sz’ for (x = 1; x < X.sz; x++) ^ user.cpp:19:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define sz size() ^ user.cpp:95:27: note: in expansion of macro ‘sz’ for (y = 1; y < Y.sz; y++) ^