classSolution {publicstaticint[] x;publicstaticintsum=0;publicstaticchar[][] board;publicList<List<String>> solveNQueens(intn) { x=newint[n];for(inti=0;i<n;i++){ x[i]=0; } board=newchar[n][n];for(inti=0;i<n;i++){for(intj=0;j<n;j++) { board[i][j]= '.'; } }...