Compilare: user.cpp: In function ‘int main()’: user.cpp:25:80: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(a[i-1][j]==-1||a[i][j-1]==-1||(a[i-1][j]==a[i][j-1])&&a[i-1][j-1]!=-1) ^