Compilare: user.cpp: In function ‘int solve()’: user.cpp:28:51: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if ((mat[i][j] > 0 && mat[i][j] < H) && (i > 0 && !mat[i - 1][j] || i < N - 1 && !mat[i + 1][j] || j > 0 && !mat[i][j - 1] || j < M - 1 && !mat[i][j + 1])) { ^ user.cpp:28:109: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if ((mat[i][j] > 0 && mat[i][j] < H) && (i > 0 && !mat[i - 1][j] || i < N - 1 && !mat[i + 1][j] || j > 0 && !mat[i][j - 1] || j < M - 1 && !mat[i][j + 1])) { ^ user.cpp:28:140: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if ((mat[i][j] > 0 && mat[i][j] < H) && (i > 0 && !mat[i - 1][j] || i < N - 1 && !mat[i + 1][j] || j > 0 && !mat[i][j - 1] || j < M - 1 && !mat[i][j + 1])) { ^