Compilare: user.cpp: In function ‘bool sortbyx(coord, coord)’: user.cpp:15:29: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (q.a<w.a || q.a==w.a && q.b<w.b) ^ user.cpp: In function ‘bool sortbyy(coord, coord)’: user.cpp:20:29: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (q.b<w.b || q.b==w.b && q.a<w.a) ^ user.cpp: In function ‘int main()’: user.cpp:81:59: warning: operation on ‘v[obst[i].coord::a][obst[i].coord::b]’ may be undefined [-Wsequence-point] v[obst[i].a][obst[i].b]=v[obst[i].a][obst[i].b]=-1; ^ user.cpp:83:31: warning: operation on ‘v[t.coord::a][t.coord::b]’ may be undefined [-Wsequence-point] v[t.a][t.b]=v[t.a][t.b]=-1; ^