Compilare: user.cpp: In function ‘int main()’: user.cpp:76:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(Xpos[i] == NextDown[kx[i]].size()-1 || Ypos[i] == NextRight[ky[i]].size()-1) continue; // this point can't be an upper_left corner ^ user.cpp:76:86: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(Xpos[i] == NextDown[kx[i]].size()-1 || Ypos[i] == NextRight[ky[i]].size()-1) continue; // this point can't be an upper_left corner ^ user.cpp:81:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(Xpos[ri] == NextDown[kx[ri]].size()-1 || Ypos[di] == NextRight[ky[di]].size()-1) continue; // can't find lower_right corner ^ user.cpp:81:90: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(Xpos[ri] == NextDown[kx[ri]].size()-1 || Ypos[di] == NextRight[ky[di]].size()-1) continue; // can't find lower_right corner ^ user.cpp:72:15: warning: unused variable ‘posx’ [-Wunused-variable] int ri,di,posx,posy,lr; ^ user.cpp:72:20: warning: unused variable ‘posy’ [-Wunused-variable] int ri,di,posx,posy,lr; ^