Compilare: user.cpp: In function ‘int main()’: user.cpp:90:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < OX[CntX].size(); ++ i) ^ user.cpp:95:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < OX[i].size() && OK; ++ j) ^ user.cpp:98:94: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] int PrevY = (j == 0 ? OX[i][j] : OX[i][j - 1]), NextY = (j == OX[i].size() - 1 ? OX[i][j] : OX[i][j + 1]); ^ user.cpp:103:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < OX[i].size() && OK; ++ j) ^