Compilare: user.cpp: In function ‘int main()’: user.cpp:102:221: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while( ( ( a[i + 1][n3] - a[i + 1][n3 - 1] ) <= ( a[j + 1][n2] - a[j + 1][n2 - 1] ) && n2 > 0 ) || ( ( a[i + 1][n3] - a[i + 1][n3 - 1] ) <= ( a[i - 1][n1] - a[i - 1][n1 - 1] ) && n1 > 0 ) && n3 <= m ){ ^ user.cpp:171:221: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while( ( ( a[i + 1][n3] - a[i + 1][n3 - 1] ) <= ( a[j + 1][n2] - a[j + 1][n2 - 1] ) && n2 > 0 ) || ( ( a[i + 1][n3] - a[i + 1][n3 - 1] ) <= ( a[i - 1][n1] - a[i - 1][n1 - 1] ) && n1 > 0 ) && n3 <= m ){ ^